TOXORHINA. ORIMARGA. 423 



tudinal vein ; 1st vein ending in costa a little beyond auxiliary 

 vein ; * tlie 2nd vein simple, gently bisinuate, ending exactly 

 at tip of wing ; no 3rd vein ; anterior cross-vein moderately 

 long, equal in length to the basal side of the discal cell, which 

 in one wing is open and coalescent with the 3rd posterior cell, 

 but closed in the other by a cross-vein placed just before the 

 fork of the posterior branch of the 4th vein ; lower branch of 

 4th vein forked widely near tip ; posterior cross-vein immediately 

 before proximal side of discal cell. Halteres black. 



Length 3 millim. 



Described from one female from Kurseong, 27. vi. 10 (Annan- 

 dale). 



Type in the Indian Museum. 



Though the discal cell is open and there is no mention of this 

 being the case in any of the three living species of the genus, there 

 can be no possible doubt of the present form being a Toxorhina in 

 the fullest sense. In every other way the venation agrees with 

 Osten Sacken's plate and description. The gradual absorption in 

 the costa of the 1st longitudinal vein, the entire nbsence of the 

 3rd vein (in itself a character of quite exceptional occurrence), 

 are very strong generic characters. Moreover, the enormously 

 prolonged rostrum ; the absence, so far as I am aware, of palpi 

 (Osten Sacken says they are very minute, with coalescent joints) ; 

 the enlarged mesosternum, causing a considerably larger distance 

 than usual between the fore and middle coxae ; and the peculiar 

 form of the antennae, agreeing exactly with Osten Sacken's 

 description, all combine to make this species a Toxorliina with 

 practical certainty. 



Genus ORIMARGrA, Os. Sac. 



Orimarga, Osten Sacken, Monog. Dipt. N. Amer. iv, p. 120 (1869). 

 Ningius, Wallengren, Entom. Tidskr. ii, p. 183 (1881). 

 'f Spyloptera, Rondani, Prod. Dipt. Ital. i, p. 181 (1856). 



G-ENOTYPE, Limnobia alpina, Zett. ; according to, but not 

 selected by, Coquillet (1910). 



Head : eyes large, glabrous, frons rather narrow. Proboscis 

 projecting, cylindrical, much shorter than the head. Antennae 

 l(3-jointed, the joints shortly oval. Thorax rather convex and 

 elongated in front, forming a neck ; mesosternum long. Abdomen 

 elongate, narrow. Genitalia of male composed of a pair of 

 claspers, with slender horny claw-shaped second joint ; lower plate 

 elongate. In the female a small slender pointed pair of valves. 



* I cannot perceive any subcostal cross-vein in my species, hut it is 

 impossible to say for certain that it is not present. 



