A REVISION OF THE GENUS LEPTOCONOPS, SKUSE. 11 



$. — Length of body (specimen mounted in balsam), 2-5 mm. ; length of wing, 

 IS mm. ; length of antenna, 0'48 mm. ; width of head, 0"40 mm. 



Head. Eyes relatively narrowly separated, the space between them almost one- 

 fifth the greatest width of the head ; clypeus with two pairs of short hairs. Third 

 palpal segment (fig. 2, a) relatively not very strongly swollen, elongate, the orifice of 

 the sensory pore extending over the greater portion of the inner side ; fourth segment 

 subcylindrical, about two-thirds the length of the third. Antennae (fig. 5, h) : fourth 

 to thirteenth segments spherical, with the hairs arranged in oblique whorls, and the 

 spines unequal in size and asymmetrically arranged ; terminal segment short, 

 approximately one and two-thirds as long as broad. Wings with anterior veins as 

 shown in fig. 8, a* Legs : first and second tarsal segments without differentiated 

 spines, except distally. Claws (fig. 4, e) simple and equal, each with a bristle arising 

 from the base. Lamellae bluntly rounded distally, 0-22 the length of the wing. 

 Spermathecae two, heavily chitinised, subspherical (diameter 30//) ; the commence- 

 ment of the duct chitinised for a short distance. 



Leptoconops longicornis, sp. nov. 



2. — Length of bod}^ (two specimens), 3'5 mm. ; length of wing, 2-2 mm. ; length 

 of antennae, 0'84 mm. ; width of head, 0'44 mm. 



Head black,f the antennal depressions pale brown, sparsely clothed with short 

 hairs on the occiput and vertex ; clypeus blackish, with three pairs of dark brown 

 hairs ; eyes not very widely separated, the space between them being approximately 

 one-fifth the width of the head ; frons with a pair of short hairs situated, one on each 

 side, near the lower margins of the eyes. Proboscis blackish brown. Palpi blackish 

 brown, with dark hairs ; third segment elongate, relatively slightly swollen, the 

 orifice of the sensory pit large, occupying the distal two-thirds of the inner side ; 

 fourth segment subcylindrical, stout and short, not more than two-thirds the length 

 of the third. Antennae (fig. 5, d) long, dark brown, bearing short brown hairs, and 

 long, slightly curved, clear, pointed spines ; fourth to thirteenth segments subspherical 

 to narrowly oval, from LO to 2-1 as long as broad ; fourteenth segment approximately 

 six and one-half times as long as broad, equal in length to the three preceding segments 

 together. Thorax shining black (from indications still existing in the dried specimens 

 the scutum was probably dark grey pollinose originall}'), sparsely clothed with short 

 dark hairs ; scutellum normally with three pairs of stout black bristles ; pleurae 

 and pectus shining black. Wings white, iridescent, the fusion of the extremities of the 

 anterior veins forming an elongate brown spot near the middle of the upper margin ; 

 anterior veins as shown (fig. 8, b), the distal interspace clearly defined, fifth vein 

 bifurcating appreciably before the extremity of the costa. Halteres greyish buff, the 

 stems somewhat infuscated. Legs uniformly dark brown, clothed with dark hairs ; 

 tarsi without distinct spines (except perhaps a distal pair on the metatarsi), but with 

 some of the ventral bristles on the first and second segments stout and spine- 

 like. Claws, equal and simple, similar to those of L. stygins. Abdomen dax\>ihxown, 

 with short dark hairs. Lamellae (fig. 6) paler brown, 0T8 the length of the wing. 

 Spermathecae two, heavily chitinised, subspherical (diameter 50/<) ; the origin of 

 the duct only chitinised. 



* I have been totally unable to distinguish the small " vein " (termed by Skuse the " marginal 

 cross-vein ") connecting the distal portions of the first and third veins. The first vein, however, 

 bends sharply upwards just before its termination and at the angle is distinctly swollen, causing 

 the lower edge of the vein to approach more closely that portion of the third vein immediately 

 below it ; at first sight, therefore, the first and third veins appear to be connected at this point 

 and to enclose a minute distal interspace. 



t The colours given in the descriptions of this and the following species are as observed in 

 specimens which had been dried after preservation in formalin. 



