4 GEO. H. HORN, M. D. 



Claws slender and moderately long. 



Tibial spurs moderately long, middle and posterior tibite each 

 with two. 



The preceding description is applicable more especially to the male. 



The females are shorter, more robust and convex ; body without 

 wings. The cephalic j)rocesses are less developed than in the male, 

 the clypeal horn scarcely emarginate. The eyes are smaller than in 

 the male and quite flat. The legs are shorter and more robust, al- 

 though otherwise similar to the male. The tarsi are scarcely half as 

 long as the tibise. 



As a whole the mouth parts of Pleocoma are small and feebly de- 

 veloped, and so enclosed as to be, apparently, of no use to the insect 

 in taking food. It is probable that during their shoi't life in the 

 imago state very little or no food is taken. 



The an ten me vary in their construction according to the species. 

 The club is not placed at a right angle to the stem, but forms quite 

 an acute angle with it. The lamelhe are not of the same form, the 

 lower edge being more or less irregular or undulating. Xor are the 

 lamellae directly superimposed, as they overlap each other in such a 

 manner as to be misleading without considerable care. The accom- 

 panying sketches of the antennse are to a certain extent diagrams 

 representing all the lamelhe of their proper length brought into 

 vision at the same time. The middle joint of the club is always 

 longer, from this inward and outward the joints are slightly shorter. 

 The first joint of the club is more or less glabrous, at most the edges 

 only have the sensitive surface, the proximal side is fimbriate with 

 moderately long hairs, while the edges of all the lamellae have shorter 

 and stiffer bristles. 



The following species are now known : 



Third joint of antemise shorter and narrower than the first, the club with but 

 four long lamellPB. 

 Seventh joint of antennfe merely transverse, not prohmged in a i)rocess: hairs 



of underside of body black Ri<>k!>»eckeri. 



Seventh joint prolonged in a process one-third as long as the following joint; 



hairs of underside yellow ... fiiiihriata. 



Seventh joint i)rolonge(l in a i)roccss two-thirds as long as the eighth : hairs 



yellow Bolli*eil!<iii. 



Third joint of antenna' nearly as long and as stout as the first joint. 



