1930 ] 
Notes on American N emestrinidae 
289 
Quite possibly Neorhynchocephalus should not be given 
generic rank, and rather be regarded as at most of subgene- 
ric value. While it is not represented in the Old World, so 
far as we know, it does not contain all the New World 
species. Lichtwardt has described Rhynchocephalus mendo- 
zanus (1910, Deutsch. Ent. Zeitschr., p. 594; 9 3), from 
Argentina, which he says has the venation of R. tauscheri , 
except “dass sich Cubitus und Media in einem Schnittpunkte 
trennen.” 
The four known species of Neorhynchocephalus may be 
separated as follows: 
1. Two branches of fourth longitudinal vein united before 
the costa, the second posterior cell closed and with a 
long apical stalk. Black, with dense, rather short, pale 
yellowish pile; the abdomen not distinctly banded nor 
spotted. Length, 6 to 10 mm. ... N . sackeni (Williston). 
Two branches of fourth longitudinal vein ending freely 
in the costa, some distance from each other, the second 
posterior cell not stalked at the apex 2. 
2. North and Central American species. Tibiae and tarsi 
darker than the femora, especially those of the hind 
legs. Body covered with pale yellowish pile ; the abdo- 
minal tergites with more or less distinct, white, apical 
fringes, and with small tufts of black hair on the sides ; 
tergites often spotted with yellowish red. Frons linear 
in the male, the eyes nearly touching over some length 
below the ocellar triangle. Length, 8.5 to 14 mm. 
N. volaticus (Williston). 
South American species. Legs uniformly pale colored, 
dirty yellow to reddish-yellow. Abdominal tergites 
without distinct, white, apical fringes, but on the sides 
with more prominent tufts of hair, which are partly 
black 3. 
3. Head, thorax and legs densely covered with long bright 
sulphur-yellow pile. Wings distinctly infuscated at the 
extreme base. Length, 8 to 10 mm. (Male unknown 
tome) N. sulphur eus (Wiedemann). 
