999 
A Monograph of Culicidae. 
Observations. —This species was instituted by Arribalzaga for 
a closely related insect to the following. I find the two, 
M. separaius and Fabricius’ M. JiaemcrrJioidalis, in the same series 
in the old British Museum collection under the name haemo¬ 
rrhoidalis. Although the resemblance is very striking, I think the 
two species are undoubtedly distinct, the distinguishing character 
being that the third and fourth joints of the palpi are nearly 
equal in this species, but in haemorrhoidalis the third is much 
longer than the fourth. It seems to be the commoner of the two 
O 
species, specimens having been received from widely separate 
areas. I feel pretty sure that the 9’ s described here are of this 
species, although they were placed as unnamed distinct species in 
the collection by Walker. The two 9’ s differ slightly from one 
another, one having the basal half only of the first tarsal joint 
white. 
A specimen from the Lower Amazon bears a label with “ said 
to bite very badly ” on it. 
Arribalzaga’s specimen was brought from Formosa (Chaco) 
by Dr. E. L. Holmberg. Arribalzaga says: “ None of the 
specimens which I have examined have the slightest trace of the 
white silvery ring on the second tarsal joint seen in the two 9 s 
(haemorrhoidalis) by M. Macquart.” I have observed the white 
in separatus in the 9 myself, but not in the $. But as the 
specific difference lies in the palpi no attention need be paid to 
minor details of colour. From Macquart’s figure of the $ and 
9 he had evidently the two species before him. 
2. Megarhinus haemorrhoidalis. Fabricius. 
(Ent. Syst. iv. 401, 5 (1794), Fab.; Syst. Anti. iv. 25 (1805), Fab.; Dipt. 
Exotica, i. 6, Wied. (1821); Auss. Zwei. Ins. 2 (1828), Wied.; Hist d. 
Dipt. Suit. A. Buff. i. 33 (1834), Macq.; Mem. Soc. d’Hist. Nat. de 
Paris, iii. p. 412 (1827), Bob. Desv.; List Dipt. Brit. Mus. i. p. 1 
(1848), Walker; Fn. Iruqui. Studi. Entom. p. 108, Bondani; Dipt. 
Argentina, p. 32, Arribalzaga.) 
Very like the previous species, but with the third joint of the 
palpus longer than the fourth joint. 
I have not seen a fresh specimen, but I find two broken 
specimens in the collection mixed up with the former species. 
Fabricius’ description is as follows : — 
“ Fuscous, abdomen at apex, with reddish cilia, very large for this genus ; 
antennae very densely verticillate pilose; fuscous with the first joint nude, 
