NEMATUS ORBITALIS. 119 



rated, but maculiger has the antennae more rufescent 

 beneath, with the third joint longer compared to the 

 fourth ; the mark on vertex is larger, the front is not 

 so sharply pointed between the antennae (in both 

 sexes). In both species the amount of black on 

 hinder tarsi and tibiae and back of abdomen varies. 



The larva has been found by Mr. Fletcher. It is 

 very like that of N. lacteus, but paler. Its habits jire 

 those of lacteus. 



Rare and local. Clydesdale, Worcester. 



Continental distribution. Sweden. 



48. NEMATUS OEBTTALIS. 

 PL XXI, fig. 5, Saw. 



Nematus orbitalis, Cam., E. M. M., xx, 265. 



Pallid green, the head from the base of the antennae, including the 

 whole of the frontal area, vertex between the sutures and the occiput 

 behind, meso-metanotum, and a broad continuous band on dorsum of 

 abdomen, black. Antennae as long as the thorax and abdomen together, 

 black above, brownish beneath, third joint nearly as long as the fourth. 

 Wings hyaline, nervures blackish, costa pale at the base, stigma 

 greenish-white. Vertex finely punctured, sutures deep, an indistinct 

 transverse one behind the ocelli. Posterior tarsi lined with fuscous 

 above. The apex of posterior tibiae and the apices of the joints of 

 anterior tarsi black. Spurs acutely pointed, about one third of the 

 length of metatarsus. 



The <^ has the antennae longer and thicker, the third joint is shorter 

 than the fourth ; the underside of the body testaceous ; the tarsi are 

 darker coloured, and there is a short line on the posterior femora 

 above. The last abdominal segment is keeled on upper side. 



Length 2^ lines. 



This species comes very near N. lacteus, from 

 which it differs in coloration only in the part imme- 

 diately behind the sutures on vertex being black in 

 both sexes, while in lacteus the entire head is black 

 behind except at the extreme edges ; otherwise the 

 present species differs from lacteus in having the front 

 and vertex punctured, the antennas if anything longer 

 and lighter coloured, the clypeus not so deeply in- 

 dented, the recurrent nervure in posterior wings is 



