NO. 1788. 



NORTH AMERICAN EROASILID^— WILSON. 



351 



in exactly the opposite direction to that in Ergasilus, and armed 

 with a small palp at its posterior distal margin; both palp and ter- 

 minal joint are conical and destitute of setaB. Maxillary hook 

 wanting. First maxilla made up of a short basal joint, fused to the 

 ventral surface, and a terminal knob armed with three or more 

 divergent plumose setse. Second maxilla with a wide basal joint 

 fused to the ventral surface of the head, and a conical terminal joint, 

 which may be either simple, as in most species, or bipartite, as in B. 

 solex Scott and in the genus Tucca. Maxiliipeds with two stout 

 basal joints, which are turned forward outside the other mouth- 

 parts and fused with the ventral surface of the head, and a terminal 

 claw bent twice into the form of the letter S; both second joint and 

 terminal claw are well armed with plumose setse. 



Male. — Mouth-parts so far forward that the upper lip lies between 

 the bases of the second antennae. Labrum longer than wide, with a 



Fig. 40.— Mouth-parts of male Bomolochus sole^. an", Second antenna; la, labrum; md, man- 

 dible; mi', FIRST maxilla; toi", second maxilla; mip, maxillipeds; p, paragnaths. 



prominent and well-roughened surface; labium similar to that in 

 the female. First three pairs of mouth-parts also similar to those in 

 the female except that they are longer and more slender. Maxilli- 

 peds large, of normal structure, and some little distance behind the 

 other mouth-parts. Their basal joints are strongly inflated, elongate 

 triangular in shape, and are attached as close to the lateral margin as 

 in the female. Indeed, in spite of the large size of the basal joints, 

 their distal ends do not meet at the mid-line by a considerable inter- 

 val. The terminal joints are in the form of long slender claws, bent 



