LO4 SYRPUIDE. 
the male; hind borders narrowly pale; male genitalia shining 
black ; hair at the base of the abdomen pale; venter black, the 
sides and hind margins of the ventral plates yellowish. Legs bare, 
of a reddish- yellow colour; cox black, but those of the front 
pair > vellowish; hind trochanters black; front tarsi broad, black ; 
imniddle tarsi dark brown, but the basal joint partly vellow; hind tarsi 

Fig. 17.—Chasmomma femoratum, sp.n. @. 
Left hind leg from inner side, x 10. 
very strong and broad, intensely black; hind femora broadly black 
at end, especially in the female, provided with eight to ten bristles ; 
hind tibiz intensely black, only the knees y ellowish. Wi ings grey en 
hyaline, the stigma and subcostal cell blackish ; apical half more or 
less infuscated. 
Type 3, an additional specimen, and type 2, from Oshogbo, 
S. Nigeria, xi.and xii.1910 (Dr. 7. F. G. Mayer); another male 
specimen from Ibadan, 8. Nigeria (Capt. Lestie). 
Genus 21. SYRITTA, Saint Fargean et Serville (1825). 
This genus seems to be very abundantly represented in_ the 
Ethiopian Region, more than 20 species being already described ; 
the species, however, appear to be very closely allied to each other, 
and as regards the coloration of ‘the legs as variable as our 
S. pipiens. Only a few of these species (such as nigrifemorata, 
latitarsata, and spinigera) are distinguished by good structural 
characters, the others are possibly not more than colour-varieties. 
The “ species” in the Collection may be separated as follows :— 
1 (4) Vena spuria not distinct, nearly obsolete, 
other veins of a yellowish colour; hind 
femora with a very long and_ strong 
spine near the base; yellow abdominal 
bands of male not interrupted in the 
middle; third antennal joint in great 
part black ; last ventral plate in the male 
with a tuft of erect bristly hairs in front 
of the genitalia. 
