38 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 125 
Male genitalia: eighth sternum bearing laterally from posterior margin 
an enlarged setae from a large base, and ventrally a pair of caliper- 
like lobes; ninth segment with anterolateral angle broad; cercus rod- 
like with a single long apical seta; clasper with a short, rodlike baso- 
dorsal process, ventral lobes rounded; tenth tergum divided into flat 
lateral plates, rounded apically, with a subapical ventral tooth; 
aedeagus with usual mesal and basal structures, apically with a large 
number of slender spines. Female genitalia: eighth and ninth segments 
with lateral rods; bursa copulatrix complex, basal group supported 
by a slender rod from apical group that has short lateral supports. 
LARVA, PUPA, AND cASE.—Not different from Z. antilliensis. 
MaTERIAL.—Holotype, male: Grenada, Balthazar, 7 Aug. 1963, O. S. Flint, 
Jr.. USNM Type 69893. Allotype, female: same data. Paratypes: same data, 
many o'o'? ?. St. Lucia, R. Galet, south of Dennery, 1 Aug. 1963, Flint and 
Cadet, 1; Vergallier River, near Marquis, 21 July 1963, Flint and Cadet, many 
3h? 9; same, but 2 Aug. 1964, 29° 49. Dominica, Clarke Hall, 1-10 March 
1965, W.W. Wirth, 1. Other: Grenada, Great River, at Balthazar, 8 Aug. 
1963, O. S. Flint, Jr., larvae, 7 o' 2? 9 metamorphotypes. 
Brotogy.—The immature stages were found on large rocks in a 
large lowland river on Grenada. It thus seems that it has identical 
breeding habits to the preceding species, but that it has replaced 
Z. antilliensis in the lowlands of Grenada and St. Lucia. 
Genus Leucotrichia Mosely 
Leucotrichia Mosely, 1934, p. 157. [Type-species: Leucotrichia melleopicta 
Mosely, 1934, by original designation.] 
This and the preceding genus are closely related, but Leucotrichia 
is found over most of North America as well as Central America. The 
male of Leucotrichia may be recognized by the unmodified antennae 
and presence of three ocelli. 
The larvae are also similar in the two genera, but those of Leuco- 
trichia lack the modified setae on the eighth and ninth terga. The 
immature stages are described in Ross (1944) and Flint (1964b), and 
so are not treated in detail here. 
Leucotrichia sarita Ross 
Fiaures 87-91 
Leucotrichia sarita Ross, 1944, p. 274. 
This species, described from Texas, is common in Mexico and Central 
America. There are some minute differences in the genitalia between 
the insular and mainland populations, but these are no greater than 
differences found on the mainland. The description is based on 
Grenadan examples. 
