NEMATUS CEOCEUS. 145 



black and a little more than a quarter the length of the metatarsus ; 

 the posterior tarsi are shorter than the tibiae. Wings ample, iridescent, 

 hyaline, the nervures fuscous, yellowish at the base, costa and stigma 

 lufceous, the latter slightly black at the base, and the former has the 

 inner edge quite black. 



The $ has the antennae the length of the body, the scutellum pale 

 with a black spot in the middle, the rest of the upper part of the body 

 and a mark on the breast black ; the stigma fuscous. 



Length 3| 4 lines. 



Ab. a. As in type, but the abdomen without any 



black bands. 



b. Body entirely luteous. . 



This species is very similar in form and coloration 

 to N. cadderensis 9 but the antennae are longer and 

 thinner and more distinctly lined with black above, 

 the vertex is usually marked with black, the frontal 

 furrows are more distinctly indicated. The frontal 

 area is not so well denned behind, nor is the middle 

 furrow of vertex so well marked at its base. In the 

 centre of the area at its apex there is a narrow furrow, 

 especially noticeable if looked at from behind, while in 

 cadderensis this furrow extends to the side, so that the 

 area has a hollow appearance, the area itself being 

 clearly marked behind the front ocellus, and the middle 

 vertical furrow is quite distinct. The body is longer 

 and narrower ; the mesonotum is scarcely punctured. 

 The wings are clear hyaline, while in cadderensis they 

 are distinctly yellowish ; the third cubital cellule is 

 shorter, being not much longer than wide ; the second 

 recurrent nervure is received farther from the trans- 

 verse cubital ; the stigma has usually its lower edge 

 black at the base ; nervures blacker ; the tarsi are not 

 paler than femora, and are as a rule darker than 

 in the other species ; the spurs are shorter than in 

 cadderensis ; and the tarsi are longer compared with 

 the tibiae. 



The c? of cadderensis differs from that of the pre- 

 sent species in having the thorax entirely black. 



The larva has the head black, the mouth paler; 

 the three thoracic segments, and the three anal 

 segments reddish-orange. The rest of the body is 



VOL. n. 10 



