Phylloicus angustior Ulmer 1905

Phylloicus angustior Ulmer

Phylloicus angustior Ulmer, 1905b:78.—Thienemann, 1909: 129.—Fischer, 1965:21.

This is one of the few Trichoptera whose larvae have been described on the basis of Venezuelan material (Thieneman, 1909). The species is widely distributed in South America, being known from northeastern and northwestern Argentina, southern Brazil, Venezuela, and in addition I have seen examples from Paraguay, Bolivia, Peru, and Colombia. The species appears to be widely distributed throughout Venezuela.

MATERIAL.—VENEZUELA, ARAGUA: Estacion Piscicultura, 1974–1975, see Table 1; 3–6 Feb 1976, 5 3. Maracay, El Limón, 19 Jan 1968, 1; 2–6 Feb 1976, 4 3; 17–23 Feb 1973, 3; 9 Apr 1973, 2; 27 May 1973, 1; 14 Jun 1973, 1; 23 Jun 1974, 1; 21 Jul 1971, 2 1. Rancho Grande, 3 Jan 1966, 1; 23 Jan 1978, 1; 12 Mar 1956, 1; 3 Apr 1967, 1; 26 Apr 1968, 1; 27 Apr 1967, 1; 8–11 Jun 1976, 1; 11 Jun 1958, 1; 16–23 Oct 1966, 1; 23 Oct 1968, 1; 25 Nov 1949, 1. Carretera Maracay-Choroni, 17 Jun 1975, 1. 1 km S Rancho Grande, 5 Feb 1976, 4. Dos Riitos, 6 km N Rancho Grande, 4 Feb 1976, 1. BARINAS: Barinitas, 22–26 Feb 1969, 1. 22 km N Barinitas, 24 Feb 1976, 1. MERIDA: Merida, La Pedregosa, 21 Feb 1976, 4 2; 1 Jun 1976, 1. Río Montalban, 19 km W Merida, 20 Feb 1976, 1. MIRANDA: Agua Blanca, Parque Nacional Guatopo, 7 Feb 1976, 1 3. Santa Cruz de Río Grande, 7 Feb 1976, 1. MONAGAS: Río Morichal Largo, puente, 31 Aug-3 Sep 1975, 1 1. TRUJILLO: Boconó, 12 Aug 1964, 1. Cuicas, 12 Aug 1964, 2. DISTRITO FEDERAL: Cumbre de Boqueron, frente a Bajo Seco, 30 Nov 1967, 1.

Phylloicus angustior Ulmer

Phylloicus angustior Ulmer, 1905b:78.—Fischer, 1965:21.—Flint, 1981a:36.

This is the most frequently encountered South American species of the genus. Examples have been seen from Argentina, Brazil, Bolivia, Peru, and Venezuela, in addition to Colombia. The larvae and cases have been described from Venezuelan examples (Thienemann, 1909).

MATERIAL.—COLOMBIA. DPTO. ANTIOQUIA: [Santa Fé de] Antioquia, May 1954, N. Delgado, 1 (UNCM). Medellín, 24 Jan 1960, Gallego, 1.

Phylloicus elegans Hogue and Denning

Phylloicus elegans Hogue and Denning, in Denning, Resh, and Hogue, 1983:184.

This species was recently described from Panama, and additional examples have been seen from Costa Rica, Nicaragua, and now Colombia. These examples from Colombia seem identical in terms of coloration and male genitalia to Panamanian topotypes. They differ slightly in the structure of the phcromonc glands dorsolaterally on the fourth tergum. In the Central American examples the lateral sclerotized plate is relatively broad and projects well beyond the posterior margin of tergum 4, and the lateral and posterior margins are also darkly margined. In the Colombian examples this sclcrotized plate is noticeably shorter and more pointed apicad in lateral aspect, the posterior and lateral margins are not margined but the midline is. The coloration of the species has not been described previously; it is identical to that of P. lituratus Banks. The body is mostly yellow-orange, with the legs, palpi, and antennae infuscate apically. The head and thorax dorsally are also infuscate. The wings are fuscous with cream colored marks: 2 short longitudinal stripes in the anal region basally, a transverse band which is angled posteriad from near anterior margin (an obliquely formed V mark), and a crescentic subapical band.

MATERIAL.—COLOMBIA. DPTO.. ANTIOQUIA: Quebrada Honda, Marsella [12 km SW Fredonia], 1450 m, 22 Feb 1983, O.S. Flint, Jr., 4, 2. Quebrada La Jiménez, Sopetrán (trap C), 22 May 1983, U. Matthias, 1.

Phylloicus species 1

This is apparently an undescribed species. Unfortunately, only a single alcoholic specimen, which is quite teneral, is known. There is no indication of the coloration of the species. Because color is so important in this genus, I prefer not to describe it until a well-marked, pinned male is available.

The abdomen and genitalia seem quite distinctive. There is no modification of any abdominal tergum. The base of hind wing bears a fringe of long hairs along the posterior margin which, when the wings are closed, looks like a hair-pencil. The eighth sternum is produced posteriad, but as a mesal, tongue-like extension that is not divided mesally. The remainder of the genitalia are typical of the genus, but do offer a number of distinctive characteristics.

MATERIAL.—COLOMBIA. DPTO. ANTIOQUIA: Quebrada La Cebolla, El Retira (trap A), 21 May 1983, U. Matthias, 1.

Phylloicus species 2

Together with Phylloicus species 1, this species is only known from alcoholic examples. Although many are fully hardened, it is impossible to be certain of the color pattern. They appear to be nearly uniformly dark brown, certainly without strongly contrasting marks, but subtle shadings would not be discernable in the material. The forewing length is 10–11 mm. Until good, pinned males are available, I leave this species unnamed.

The fourth abdominal tergum is strongly modified, with the posterolateral process containing dark internal sacs which almost certainly are eversible. The hindwing bears a scent-brush of long, widened hairs in a basal pocket. There is no modification of the eighth sternum. The species would appear to be closely related to the Peruvian P. spectabilis Martynov. It differs in having slender cerci, rather than broadly flattened ones as in P. spectabilis. There appear to be some differences in the fourth tergal processes between the two species in spite of their overall similarity.

MATERIAL.—COLOMBIA. DPTO. ANTIOQUIA: Qucbrada La Ayurá, Envigado (trap B), Apr 1983–Mar 1984, U. Matthias, 7, 12.