618 



NEUROPTERA. 



ance in Labrador. Though we have not reared the imago we 

 suppose it to be the Limnopkilus subpunctulatus of Zetterstedt, 

 the most abundant species we met in Labrador. The case 

 is straight, cylindrical, and built of coarse gravel, and the 

 larva is a thick, cylindrical, whitish worm. Fig. 609 repre- 

 sents the case of L. flavicornis Fabr., a European species, 

 which is often constructed of small shells. Fig. 

 610 illustrates the case of the European L.^nllu- 

 cidus Olivier, which is formed of large pieces of 

 Fig. 611. leaves laid flat over each other. 



In Sericostoma the ocelli are wanting, and the palpi are 

 pilose, the maxillary palpi of the males are four-jointed, cover- 

 ing the face like a mask. S. Americanum Walker is black 

 with black hairs ; the antennae are twice the length of the 

 body, while the anterior wings are much longer than the hind 

 ones. Fig. 611 represents the tube of a European species of 

 this genus. 



In Helicopsyche the spurs are arranged thus : 2, 2, 4, and 

 the maxillary palpi of the males mask the face, being recurved. 

 We have found the larvse of Helicopsyche glabra Hagen (Fig. 



b Fig. 012. a 



612, X, lunate patch on the basal abdominal ring; a, front 

 view of the head, enlarged ; m, mandible ; e, e3'e ; b, vertical 

 view of the end of the abdomen, enlarged), about changing 

 to pupfe, the middle of July, in Wenham Lake, Mass. One 

 had spun its operculum and lay with its head just behind 



