34 NORTH AMERICAN ANOPLURA 



terior margins nearly equal; the anterior margin with a very deep V- 

 shaped notch which reaches nearly to the posterior margin ; lateral mar- 

 gins slightly convex, the posterior margin nearly straight. The division 

 between the meso-thorax and meta-thorax is very indistinct, and the spir- 

 acles on the meso-thorax are extremely small. 



First pair of legs small, with slender claw ; second and third pairs 

 about equal in size, each with a broad, heavy claw. The tarsus of the 

 third pair bears on its outer anterior angle a short, sharp, thumb-like pro- 

 jection. Sternal plate roughly circular, about as wide as long, the anter- 

 ior margin almost straight, the posterior margin slightly pointed. First 

 and second pairs of coxae widely separated, third pair approximate or 

 contiguous. 



Abdomen elongated, with nearly parallel sides, the posterior margin 

 rounded. There are no chitinized tergites or sternites, the derm having 

 everywhere a reticulated appearance ; the divisions between the segments 

 are poorly defined, and each bears a single row of spines. First segment 

 very small, with two small, quite widely separated hairs. The second and 

 third segments are so fused as to be indistinguishable from each other, 

 a median pair of small spines alone marking the posterior margin of the 

 second. The two segments together form a trapezoid, widest behind and 

 with nearly straight lateral. margins. Third segment with six or seven 

 spines, fourth with twelve, fifth to seventh with twelve to sixteen ; all 

 awl-shaped and about as long as the segment, except that on the seventh 

 segment the third spine from the median line on each side is much longer 

 than the others, reaching beyond the end of the body. Eighth and ninth 

 segments each with two spines, those on the ninth being widely separated 

 and quite short. Eighth with two long hairs on posterior angles. 



There are four pairs of pleurites belonging to the second to fifth seg- 

 ments. The pleurites of the second segment are long and slender, ex- 

 panded, and with two short lobes at the posterior end, buried in the ven- 

 tral wall of the fused second and third segments, and entirely invisible 

 from above. The pleurites of the third segment consist of a knife-like 

 piece, with a single point, closely applied to the dorsum of the second 

 and third segments, directly dorsad of the pleurites of the second seg- 

 ment, and bearing on the posterior margin one short and one very long 

 hair. On the lateral body-wall between the pleurites of the second and 

 third segments there is a row of three small hairs. The pleurites of the 

 fourth segment are triangular in shape, with the posterior margin deeply 

 concave and bearing one long and one short hair. The ventral half is 

 attached to the ventral body-wall; the dorsal half is free and projects 



