24 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
Polycentropus insularis Banks 
Figures 42-46 
Polycentropus insularis Banks, 1938, p. 302.—Fischer, 1962, p. 83.—Flint, 1967, 
D0: 
Polycentropus insularis was described from Grenada, but the 
specimens collected on Dominica do not seem to differ significantly 
from the type. The species is rather distantly related to the other 
species of Antillean Polycentropus. From these it may be recognized 
by the lack of dorsomesal process on the clasper and the elongate 
ventromesal lip of the aedeagus. 
ApuLt.—Length of forewing 7-8 mm. Brown, body and wings 
flecked with spots of golden hair. Male genitalia: ninth segment 
rounded in lateral aspect; cercus divided into a dorsolateral ovate 
lobe bearing a smaller mesal lobe, and a long, angled, pointed process; 
clasper with a rounded dorsolateral lobe, and an elongate ventromesal 
section; aedeagus with a long pointed ventromesal lip. Female geni- 
talia: lateral lobes slightly elongate, directed apicomesally; subgenital 
plate rounded apically; bursa copulatrix complex, with a heavily 
sclerotized basal plate and lateral supports. 
Larva.—Length to 12 mm. Sclerites pale brownish, muscle scars 
conspicuously darker, head irregularly clouded with darker brown. 
Structure typical of other West Indian species. 
Pupa.—Unknown. 
MarertaL.—Holotype, male: Grenada, Grand Etang, Sept. 1910, Allen and 
Brues, collection MCZ. Other: Dominica, Pont Casse, .5 miles south, 22-24 
July 1963, O. S. Flint, Jr., 1¢, 1 larva; Pont Casse, .4 miles east, 21 April 1964, 
O. S. Flint, Jr., 19; same, but 27 April 1964, 10°; same, but 6 May 1964, 39 ; 
same, but 16 May 1964, 19 ; same, but 12 June 1964, 1 larva; same, but 23 June 
1964, 1c*; Pont Casse, 1 mile east, T. M. and J. F. G. Clarke, 2%; Pont Casse, 
1.3 miles east, 29 April 1964, O. S. Flint, Jr., 19 ; same, but 10 May 1964, 19 ; 
same, but 18 May 1964, 19; same, but 26 May 1964, 1c; same, but 11 June 
1964, 1c° 19; Pont Casse, 2.2 miles east, 1 May 1964, O.S. Flint, Jr., 1c; Pont 
Casse, 3 miles east, 15 Oct. 1966, E. L. Todd, 19 ; Sylvania Estate, 28 Jan. 1965, 
T. M. and J. F. G. Clarke, 1? ; Boeri Lake, 22 Feb. 1964, D. F. Bray, 27; Fresh- 
water Lake, 13 Oct. 1964, P. J. Spangler, 1 larva. 
Biotoay.—The species has been taken only at higher elevations on 
the islands. Larvae were found sparingly in small streams. The two 
adults taken at Boeri Lake and the larva from Freshwater Lake 
indicate that the species may breed in high elevation lakes as well. 
Family HypRopsYCHIDAE 
The Hydropsychidae are a very common and widely distributed 
family, breeding in flowing waters throughout the world. Represent- 
atives of two subfamilies, the Macronematinae and Hydropsychinae, 
