a poate 
culiciformis, De Geer. 383 
palpi are long, thin, strongly hairy and five-jointed. There 
is no great difference between the absolute lengths of the palpi 
in the male and female, but compared with the antenns they 
are to them in the males in the proportion of 1 : 2, in the 
females of 2:3. The first two joints are very short, together 
about half the length of the third joint; the last joint is a 
little longer than the penultimate. In opposition to Meigen, 
Zetterstedt, and Schiner, [ regard the palpi as commencing 
with two short clavate joints, considering the constriction that 
occurs as sufficient to constitute a joint, although this con- 
striction does not go round the whole circumference. 
The antenne are extended, rather long, in the males with 
very long and close, in the females with much shorter and 
thinifer, circlets of sete. The length of the sete increases 
somewhat posteriorly, and on the last antennal joint the sete 
are suddenly much shorter and fewer in number. The num- 
ber of antennal joints is fourteen in both sexes; but while in 
the females the joints are nearly cylindrical, about equal in 
length, only the last joint being recognizably longer than the 
penultimate (about as 6: 5), in the males the joints are fusi- 
form in inverse proportion to their length; and further, the 
middle joint is distinctly shorter than the others, of which 
again the penultimate joint is suddenly longer than the pre- 
ceding one (over twice as long) and considerably longer than 
the following one (about as 4:3). The first joint is very 
short and thick, especially in the male, in which it is nearly 
disciform. 
The eyes are naked and occupy about half the upper surface 
of the head in the female, in which they are also slightly in- 
curved; in the male they are comparatively smaller, but more 
strongly incurved ; on the lower surface they are narrow and 
erescentiform. The facets are large, round, very convex. The 
eye-spots (macule oculares) are large and well separated from 
the eyes. , 
The dorsal shield (scutwm dorsale) is large, very convex, 
slightly projecting above the head, without a transverse suture. 
The scutellum is small. 
The abdomen is long, slender, slightly narrowed posteriorly, 
with numerous and long hairs, nine-jointed *; the penultimate 
segment is suddenly much shorter than the preceding, and 
the last segment again much shorter than the penultimate. 
The external generative organs of the male are very large, 
* Schiner counts eight segments in the abdomen, and this number is 
also given for Corethra by Meigen and Schiner ; nay Zetterstedt even says 
of Corethra (1. c. p. 5470), “ Abdomen 8-annulatum (segmenta tantum 7 
numero).” 
