G 2 
Journal New York Entomological Society. [\oi. 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 antenna 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 flavipennis , of which the only known example is a male 
Color uniform throughout or very nearly, the elytra not paler.... * 
Color blackish, the elytra flavate... 
2-Prothorax sinuate at the sides subapically, the apex more or less prominent in a 
rounded or feebly sinuate lobe.. * * *. \ 
Prothorax arcuately oblique subapically, the apex ungulate and slightly prominent 6 
Prothorax broadly and evenly arcuate at apex, feebly sinuate in the mid e...... 7 
■2_Elytra distinctly punctured only toward the base, the punctures nearly obselete 
toward tip; thoracic lobe feebly and evenly crenulate. California, .basalts Lee. 
Elytra distinctly punctured throughout.*** 4 
4_Thoracic lobe narrowly rounded and with a few closely approximate serrules at 
tip Pennsylvania to Indiana.. S ay 
Thoracic lobe bioadly rounded, with a feeble cuspiform emargination and minutely 
and evenly serrulate throughout....* * * * 
e_Scutellum elongate, finely and densely rugose ; epipleuree gradually wider at base. 
female. _Body rather stout, cylindrical, dark piceo-castaneous in color throug - 
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 wi er 
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 Ma e.— y- 
lindrical, opaque, black, the legs scarcely paler, the antennae pale rufous, the 
rami infuscate; pubescence extremely minute and not very conspicuous. ea 
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 
