DYAR-KNAB] MOSQUITOES IN GENUS MEGARHINUS 243 
The canvas of the literature involved in these studies has revealed 
a strange condition regarding the status of the oldest species and the 
type of the genus, the Culex hemorrhoidalis of Fabricius. Arri- 
balzaga discovered that there were two very similar species and des- 
cribed one of them as new. Unfortunately the form he described as 
new, under the name Megarhina separata, is the Fabrician hemor- 
rhoidalis—or at least it comes nearest to it of the two. Arribalzaga 
argued that the species Macquart described* could not be hemor- 
rhoidalis because the females had white-ringed tarsi while the 
females of his (assumed) hemorrhoidalis showed no trace of such 
markings. His separata was described from the male alone and as 
he says nothing of the female it must have been unknown to him. 
Macquart’s specimens unquestionably represent the true hemorrhot- 
dalis for they came from the type-locality, Cayenne, and the neigh- 
boring British Guiana, and in the description he definitely states that 
the third and fourth segments of the palpi are of equal length in the 
male. The hind tarsi of his females are white-ringed. Thus the 
M. hemorrhoidalis of Arribalzaga and subsequent authors is the new 
species and is characterized by the long third segment of the palpi 
of the male and the absence of white on the tarsi of the female. In 
his table of Megarhinus’ Theobald attributes white-ringed tarsi to 
the females of both species, but as no description of the female of his, 
hemorrhoidalis follows we take this to be merely an assumption... 
Giles’s statement, under M. hemorrhoidalis,*? that the middle and 
hind tarsi of the female are white-ringed seems to be an error of 
compilation, for his remarks do not appear to have been based upon 
specimens. We propose for this form the name /ynchi. The ref- 
erences and synonymy of the two species should stand as follows: 
MEGARHINUS HAZMORRHOIDALIS (Fabricius) 
Culex hemorrhoidalis Fasrictus, 1794, Entomologia Systematica, v. 4, 
p. 401, no. 5. 
Culex hemorrhoidalis, Fasrictus, 1805, Systema Antliatorum, p. 35, no. 8. 
Megarhinus hemorrhoidalis, RoptNEAU-DeEsvoipy, 1827, Mémoires de la 
Soc. d’hist. nat. de Paris, v. 3, p. 412. 
Culex hemorrhoidalis, WiEDEMANN, 1828, Aussereuropdische zweifliige- 
lige Insekten, v. I, p. 2. 
Culex hemorrhoidalis MAcguart, 1834, Histoire naturelle des Insectes, 
Dipteres, v. I, p. 33. 
Megarhina hemorrhoidalis Macguart, 1838, Diptéres exotiques, v. I, p. 32. 
* Diptéres exotiques, v. I, p. 32 (1838). 
?Mon. Culic, v. 1, p. 218. 
3Gnats or Mosquitoes, 2 ed., p. 270 (1902). 
