20 HENRY F. CARTER. 



brown, tarsi whitish, metatarsi without spines ; anterior femora shghtly thickened ; 

 claws bilid, equal, the branch shorter. Abdomen red ; lamellae long and whitish. 



Length 1 -5 mm. 



Habitat. Bengal : Champaran, Bettiah, iii, 1908. 



This species should be easily recognised by the structure of the claws, the absence 

 of spines on the metatarsi, and the relative positions of the extremity of the third vein 

 and bifurcation of the fifth vein ; that the latter should take place considerably beyond 

 (" tres distale ") the junction of the third vein with the costa is unusual. 



Leptoconops siamensis, sp.nov. 



5. — Length of body, 3-5 mm. ; length of wing, 1-8 mm. ; length of antenna, 

 0-6 mm. ; width of head, 0-43 mm. 



Head dull brown, the antennal depression creamy-white, clothed with dark brown 

 hairs on the occiput ; clypeus rather paler brown, with four dark brown hairs on each 

 side of the middle line ; eyes relatively not very widely separated, the space between 

 them almost one-fifth the greatest width of the head and devoid of hairs. Proboscis 

 pale brown. Palpi (fig. 2,/) pale brown, with brown hairs ; third and fourth segments 

 elongate, subequal ; the third strongly incrassate, with a deep sensory pore, the orifice 

 of which is very large and occupies almost the entire length of the inner side. 

 Antennae moderately long, yellowish brown, with short pale brown hairs and slightly 

 curved, pointed, transparent spines ; segments 4 to 13 subspherical to oval, the 

 length varying from 0-8 to 1-3 times the breadth; terminal segment (fig. 5, a) 

 elongate, equal in length to the preceding two and one-third segments together. 

 Thorax : disc dark umber-brown, pollinose, clothed with short brown hairs ; pro- 

 thoracic lobes and humeral callus yellowish brown ; scutellum and postscutellum rather 

 darker than the disc, the former with three pairs of strong median bristles and two 

 pairs of small lateral hairs ; pleurae and pectus dark umber-brown. Wings whitish, 

 venation normal, the first and third veins (fig. 8, d) fused distally, not forming an 

 interspace. Legs entirely brownish yellow, bearing pale brown hairs and, on some of 

 the tarsal segments, stout blackish spines ; fore femora and tibiae slightly swollen 

 and somewhat shortened, tibia of all the legs with an apical spur ; metatarsi each 

 with two sub-ventral or ventro-lateral rows of strong spines,* the second and third 

 tarsal segments of the fore and middle legs each with two apical spines, of hind legs 

 wanting. Claws (fig. 4, /) of fore and middle legs equal, each with a large (at least 

 half the length of the claw) strong tooth arising from the base. Abdomen waxen 

 creamy white above and below, clothed with short hairs. Lamellae brownish yellow, 

 approximately • 25 times the length of the wing. Spermathecae two, rather narrowly 

 oval {GSfi X 38 fj) , highly chitinised ; commencement of the duct chitinised for a very 

 short distance. 



Habitat. Siam : Patani Cape {H. C. Robinson & A^. Annandale). One female 

 (type) in the British Museum Collection. 



This species is not closely allied to any of the known members of Leptoconops 

 {sens. I at.) ; it agrees with L. indictis in regard to the structure of the claws, but 

 may readily be separated therefrom by its relatively large size and the powerful 

 spinose armature of its metatarsi. In the latter character and the reduction in length 

 of the fore legs it suggests Acanthoconops {q.v.). 



* The development of these spines has not proceeded uniformly, and although normally paired, 

 the spine on one side is often much smaller than that on the other and may be represented by a 

 strong bristle. The number of spines present on the same segments of corresponding legs there- 

 fore varies, and on the metatarsi of the single specimen available was — fore legs 18 and 15, middle 

 legs 14 and 15, hind legs 9 and ? (the metatarsus of the corresponding leg missing). 



