Casey — Observations on the Staphylinidae. 411 



more coarsely and closely punctured, with a narrow impunctate median 

 line; antennae stout distally, the third joint elongate but evidently 

 shorter than the second ; prothorax narrower, much elongated, the sides 

 quite as strongly converging posteriorly but more parallel anteriorly, 

 distinctly narrower than the head as well as the elytra, similarly punc- 

 tured ; elytra elongate, shorter but distinctly wider than the prothorax, 

 equal in width to the head; abdomen at base narrower than the elytra, 

 the sides straight, gradually diverging to the fifth segment which is as 

 wide as the elytra or head; finely, rather sparsely punctulate. Length 



6.0 mm. ; width 0.68 mm. Louisiana nigripennis Lee. 



Elytra and abdomen piceous-black to black, the hind margin of the former 

 pale testaceous for a fifth or sixth of the length, the prothorax and legs 

 very pale, the head and antennae dark, testaceous; headless devel- 

 oped, elongate, gradually broader toward base, the angles broadly 

 rounded; punctures rather fine but deep and very close-set; prothorax 

 nearly as in pallidus, but rather less elongate and less evidently nar- 

 rower than the head, the sides equally strongly converging posteriorly, 

 the angles equally rounded, the punctures very fine and notably sparser; 

 elytra elongate, evidently shorter and much wider than the prothorax, 

 the punctures very fine and sparse, not at all serial; abdomen nearly as 

 \n nigripennis. Length 3.7-4.5 mm.; width 0.63-0.7 mm. Texas (Gal- 

 veston) and Louisiana rnficollis Lee. 



None of my examples of pallidus have the elytra darker 

 than a rather pale piceo-testaceous tint and similar in color 

 to the abdomen, and the species differs in this way from 

 nigripetinis , as well as by its larger size, rather stouter form 

 and larger and broader head. 



Hesperolinus n. gen. 



The third joint of the maxillary palpi resumes here its 

 usual form, being slightly thickened apically and narrowed 

 basally, less compressed than in the three preceding genera 

 and more elongate, the slender though evidently conical 

 fourth joint being about one-half as long as the third, and 

 strongly oblique in insertion. As in the preceding genus 

 there is a suggestion of the flattened longitudinal line behind 

 the eyes, which is here tolerably well defined above by the 

 convex polished post-ocular line but very indefinitely so along 

 its lower margin. The prosternum also resumes its usual 

 wide unconstricted form, the hypomera being normally narrow 

 anteriorly and the lateral edge of the pronotum is fine but 

 distinctly acute to the tip. The antennae are nearly of the 



