140 H. C. FALL. 



tal iu front where it is bifoveate for the reception of the front coxae. 

 Metasternum rather long, side pieces wide. Front coxae contiguous, 

 middle coxae narrowly separated in most species, nearly or quite 

 contiguous in a few. Legs rather slender, femora moderately thick- 

 ened, not clavate, but subpedunculate at base in marginicollis • 

 tibiae and tarsi slender, the latter, however, in variable degree, 

 being relatively stout in marginicollis and exceedingly slender in 

 trapezoideus. First joint of tarsi equal to the two or rarely the three 

 following; second joint subequal to the next two; fourth shortest, 

 about as wide as long and more or less emarginate at apex (except 

 marginicollis) ; fifth inserted upon the upper face of the fourth, 

 usually nearly as long as the third and fourth united, and from two 

 to three times as long as wide. Ventral segments not very unequal, 

 the second always longer than the first, the fifth longer than the 

 third or fourth. A sixth segment is nearly always visible and is 

 usually sinuate or feebly notched at tip, the emargination usually a 

 little more pronounced in the male, but in some species scarcely 

 different in the sexes, in fissuratus the emargination is unusually 

 deep. 



The species of this genus are more or less elongate, parallel, mod- 

 erately convex insects varying in length from 2-5.5 mm. They are 

 all clothed with fine recumbent hairs which are very short and 

 sparse in a few species, moderately plentiful in others, and in one — 

 marginicollis — there are short intermixed erect hairs. Nearly all 

 occur on pines. 



Antennae 10-jointed 5. 



Antennae 11-jointed 2. 



2. Pubescence with intermixed, short erect hairs; sides of pronotum serrate; last 



joint of maxillary palpi widest at or behind the middle 4. 



Pubescence without intermixed erect hairs; sides of pronotum not serrate; 

 last joint of maxillary palpi widest toward the apex 3. 



3. Ninth joint of antenna? shorter than the three preceding united in both sexes. 



Elytra more densely punctate (Atlantic States j 1. mollis. 



Elytra less densely punctate (Pacific Coast). 



Joints 6-8 of antennae each more than twice as long as wide. 



2. socialis. 

 Joints 6-8 of antennae always less than twice as long as wide. 



3. punctulatuN. 

 Ninth joint of antennae as long as the three or four preceding united. 

 Sides of prothorax nearly straight and convergent anteriorly, the front an- 

 gles rounded ; ninth joint of antennae equal to the three and one-half 

 preceding ( 9?) J brown, prothorax not granulate- -4. convergent. 



