242 Natural History Bulletin. 



gined. Venter flattened along the middle, anterior trochan- 

 ters with a hair-like spine contiguous to the surface of the 

 femur. Legs moderately strong, tibiae nearly straight. No 

 reliable sexual marks have been discovered in any species of 

 this genus. 

 Habitat. 



PSELAPTRICHUS, Brcudcl. 



Antennal insertions approximate, front prolonged narrow, 

 sulcate. Maxillary palpus very long, the second joint sigmoid- 

 clavate and coarsely tuberculate, the third small quadrate, the 

 fourth broadly securiform, as long as the second with short 

 erect pubescence. 



P. TUBERCULiPALPUs, Brciidcl. Ycllowish brown, pubes- 

 cence in regular rows, form slender, slightly convex. Length, 

 1.66 mm. Plate VII., Fig. 24. 



Head flat above, longer than wide, widest between the eyes, 

 which are small and situated at the angles of a pentagon form- 

 ing the discus of the vertex posterior to the oblong frontal 

 prolongation; the latter nearly quadrate, arcuate in front, 

 sulcate in the middle, the lateral half with the suface plane 

 and inclined toward the sulcus; just before the e_ye-line are 

 two small fovece, mutually twice as distant as either from the 

 eye and connected b}' a straight angular shallow sulcus with 

 the frontal fissure; occiput slightly elevated with a fine carina 

 in the middle, labrum small transverse, clypeus anteriorly 

 trisinuate; antennal cavities large, from the middle of the 

 e3'es to the middle of the posterior limit of the antennal cavi- 

 ties a fine carina, and between those cavities a narrow frontal 

 septum. AntenncB as long as the head and prothorax con- 

 joined, first joint cono-cylindrical, half as long as the head, 

 second oval, as wide as the first, third and seventh less than 

 half as wide as the preceding joints, globular, eighth wider, 

 not longer, ninth transversly oval, tenth twice as wide as long, 

 eleventh oval, twice as wide as the second joint and one-half 

 longer, with long pubescence. Prothorax as long as wide, 



