356 3IE. W. WESCHE ON THE NEW 



On examining the West African Diptei-a at the British Museum I found 

 that Dr. W. M. Graham had brought home from Obuasi, Ashanti, four 

 specimens (one ^J, two ? , and one whose sex was difficult to determine as 

 the abdomen was missing) of an insect with simihir mouth-parts and antennse, 

 but with the wings differing in pigmentation and nervation. These flies 

 were undetermined and had no relatives in the collection. 



A comparison of the venation of my material showed me that they could 

 not all be included in the limits of a single genus. I therefore propose to 

 establish a new subfamily, the Ceratocheilinse, containing the genera 

 Ceratocheilus * and Neoceratoclieilus. 



The condition of the sixth lonoitudinal vein suggests affinities with the 

 Ptychopterinae, though a discal cell shows a closer relationship to Gi/noplistia; 

 but the differences of other veins, of antennae, and of mouth are exceedingly 

 marked. Apart from the condition of the sixth vein, the Ceratocheilinfe are 

 distinguished from the Limnobinse, to which they bear a certain resemblance, 

 by the antennae, and by the absence of the tooth on the claws ; and from 

 Geranoynyia by the paraglossae^ which cohere, and by the situation of the 

 palpi, at the distal end of the proboscis, whereas in Geranomyia they are 

 situated at the base near the head. 



Subfamily Ceratocheilin^, nov. 



Small flies with the usual snout or clypeus of the Tipulidae absent or 

 represented by a plate which projects above the proboscis. 



Proboscis exceedingly long and fine, from eight to fourteen times as long- 

 as the head, the palpi inserted at the tip. Antennse with the first joint 

 shortly cylindrical, the second much larger, subcone-shaped, with the base 

 in the antei'ior position, the third smaller, cone-shaped, with the base in the 

 posterior position ; the apex bearing a long style consisting of a variable 

 number of joints, the last two bearing long bristles. 



Wings having the sixth longitudinal vein in the same condition as in 

 Ptyelioptera and Gynoj^Ustia, and the second absent or present. 



Life-history unknown. 



Neoceratocheilus, gen. nov. 



Small dark grey flies with the characteristic antennse and proboscis, but 

 are distinguished by the wing-venation and absence of pigmentation. 



Head globular, with a flat plate inserted at the dorsal base of the proboscis ; 

 the proboscis (labium) exceedingly long and thin ; the tip pointed and the 

 paraglossse (labella) unseparated and minute, appearing in dry specimens to 



* Horned lip or labium. 



