THE CANADIAN ENTOMOLOGIST. 215 



are minute and apparently somewhat atrophied, especially in the female, 

 but they have not been so successfully examined as to be clearly under- 

 stood. The mandibles are minute and rudimentary, and too widely 

 separated to have any function. In the male the maxillary palpi are very 

 small and slender, with a short basal joint, the second longer than wide, 

 the third narrow, not longer than wide, fourth equal to the third in length, 

 subulate. Mentum short and narrow, transverse, arcuate in front, ligula 

 narrower, twice as long as the mentum, palpi apparently of two subequal 

 joints, together not longer than the terminal one of the maxillary palpi. 

 These organs are smaller in the female and still more difficult to verify. 

 The gular sutures are obscure, but sometimes obsoletely indicated in the 

 female when they are approximate in front and diverging behind. The 

 eyes are large, prominent and rather coarsely granulated in the male, quite 

 small in the female, and of few facets somewhat irregularly disposed. An 

 ocellus, smaller in the female, is present between the eyes, within the apex 

 of two converging grooves which arise at the bases of the rather prominent 

 antennal supports. The antennae are ten-jointed, basal moderate, second 

 shorter, three to six very small and closely articulated, seven to ten very 

 elongate ; in the female the antennae, although of similarly proportioned 

 joints, are very much smaller and shorter. 



The pronotum is somewhat trapezoidal, broader in the female, the 

 sides not margined, but inflexed to the subobsolete prosternal sutures, the 

 pubescence of the inflexed portion similar to that of the upper surface, and 

 contrasting with the very sparsely pubescent prosternum. The prosternum 

 is convex and moderately long before the coxae, not at all separating them 

 in the male, the coxal cavities confluent, and in both sexes broadly open 

 behind. In the female the prosternum is a little shorter before the coxae, 

 broadly produced and truncate behind between the widely-separated coxae, 

 its entire length about one-half that of the pronotum. 



Mesosternum of the male transverse, slightly sinuate in front, lobed 

 behind and loosely articulated with the metasternum, between the coxje, 

 sides oblique, the lateral pieces small triangular and subequal, the epimera 

 alone reaching the coxae. 



Metasternum of the male transverse, a little longer than the second 

 and third segments of the abdomen ; episterna broad anteriorly, gradually 

 narrowed behind ; epimera not observed. 



