62 Journal New York Entomological Society. [Vol. vi. 



Ptilinus Geoff. 



The long slender pubescent appendages of the male antenna are not 

 an extreme development of the usual serriform structure, but project 

 from the base of the joints, the joints themselves being slender and some- 

 times cylindrical. In the female, however, the joints are prolonged out- 

 wardly and in an obliquely anterior direction, forming a truly and quite 

 strongly serriform antenna. The males differ from the females not only 

 in the structure of the antennae but in the much denser sculpture of the 

 entire body, and frequently to a very great degree in the form of the 

 prothorax. In the following table of the species included within my 

 cabinet, all the discriminating characters refer to the female, except in 

 the case of flavipemiis, of which the only known example is a male: — 



Color uniform throughout or very nearly, the elytra not paler 2 



Color blackish, the elytra flavate , . 8 



2 — Prothorax sinuate at the sides subapically, the apex more or less prominent in a 

 rounded or feebly sinuate lobe 3 



Prothorax arcuately oblique subapically, the apex angulate and slightly prominent 6 



Prothorax broadly and evenly arcuate at apex, feebly sinuate in the middle 7 



3 — Elytra distinctly punctured only toward the base, the punctures nearly obselete 

 toward tip; thoracic lobe feebly and evenly crenulate. California. . basalis Lee. 



Elytra distinctly punctured throughout , 4 



4 — Thoracic lobe narrowly rounded and with a few closely approximate serrules at 



tip. Pennsylvania to Indiana ruf icornis Say 



Thoracic lobe bioadly rounded, with a feeble cuspiform emargination and minutely 



and evenly serrulate throughout 5 



5 — Scutellum elongate, finely and densely rugose ; epipleurse gradually wider at base. 

 Female. — Body rather stout, cylindrical, dark piceo-castaneous in color through- 

 out, the legs scarcely, the antennae much, paler; lustre rather dull, the pubes- 

 cence very short and dense on the elytra. Head convex, minutely and densely 

 granulate, the transverse frontal impression distinct. Prothorax distinctly wider 

 than long, widest at about the middle, narrowed slightly to the base, rapidly and 

 just visibly sinuate to the apical lobe ; surface minutely and densely granulose 

 toward base, more coarsely, sparsely and irregularly so toward apex, the median 

 line finely impressed. Elytra three-fourths longer than wide, equal in width to 

 the prothorax, minutely and densely subgranulose in texture, with the punctures 

 rather strong, sparse and distinct, feebler toward tip, where they are more dis- 

 tinctly intermingled with small granules and the ground lustre is more shining. 



Length 4.0 mm.; width 1.5 mm. Nebraska lobatus, sp. nov. 



Scutellum quadrate, coarsely rugose; epipleurse rapidly wider at base. Male. — Cy- 

 lindrical, opaque, black, the legs scarcely paler, the antennas pale rufous, the 

 rami infuscate ; pubescence extremely minute and not very conspicuous. Head 

 convex, dull, minutely subgranulose, the eyes convex, separated on the front by 

 about four times their own width. Prothorax about a third wider than long 

 broadly, evenly arcuate at base, gradually narrowed and arcuate at the sides from 



