NO. 1788. NORTH AMERICAN ERGASILID.^—WILSON. 379 



BOMOLOCHUS TERES, new species. 



Plate 59, text figure 39. 



Female. — Cephalothorax semielliptical, one-half ^^^de^ than long, 

 and squarely truncated posteriorly. Anteriorly it does not cover 

 the bases of the first antennae at all, but leaves them wholly visible 

 in dorsal view. The free segments diminish regularly in width; 

 the second, third, and fourth about the same length, the fifth a 

 little shorter. The latter segment is also widened considerably at 

 the center through the bases of the fifth legs. The genital segment 

 is narrower than the fifth segment, as long as wide, with nearly flat 

 sides. The abdomen is very long and slender, and tliree-jointcd, 

 the joints diminishing one-third in length from the base toward the 

 tip, but all about the same width. 



The terminal joint is cut diagonally at the posterior corners; 

 the anal laminje are narrow and cylindrical, a little more than tmce 

 as long as wide, and strongly divergent. Each is tipped with a stout 

 inner seta, whose base is the same diameter as the tip of the lamina, 

 and a much smaller outer seta. 



The latter usually can hardly be seen because it is pressed close 

 to the base of the larger one, but sometimes it gets away from the 

 latter and becomes distinct. Both these setse are nonplumose. 

 Egg-cases somewhat wider than the genital segment, about the 

 same diameter throughout, and only reacliing to the center of the 

 terminal setae; about 100 eggs in each case. 



First antennse long and slender, reaching well beyond the lateral 

 margins, basal portion not much enlarged, fused so that the joints 

 are invisible, and bent so strongly that it forms an acute angle of 60° 

 instead of a right angle. This angle is armed with a row of very 

 large setae around its entire margin; elsewhere the setas are scattering 

 except for a small tuft at the extreme tip. Second antennas of the 

 usual pattern, the terminal joint entirely covered on its ventral and 

 posterior surfaces with dense rows of short spines. The terminal 

 claws are rather short and are reenforced by a long, straight plumose 

 seta at the inner distal corner of the terminal joint. 



The mouth parts are well defmcd; the labrum is semielliptical, 

 with the posterior corners enlarged, rounded, and projecting, and the 

 posterior margin reentrant. Every portion of the surface of the 

 labrum, even to its extreme margin, is densely covered with fine hairs. 

 The mandibles are smooth and simple and are well concealed beneath 

 the labrum. 



The first maxillae are of the usual pattern, each bearing three 

 strongly divergent setae. The second maxillae are two-jointed, the 

 basal joint considerably enlarged, the terminal joint in the shape of 

 a large smooth spine five times as long as wide and acutely pointed. 



