June 1882. ] SYNOPTIC TABLES OF COLEOPTERA. 16 
PTEROSTICHUS. 
Division 1. Dorsal punctures wanting; marginal stria single. 
Posterior tarsi stout, not grooved on the outer side; epistoma and labrum emarginate; 
prosternum feebly margined behind............. ... HAMMATOMERUS, Chaud. 
_ Joints of hind and middle tarsi et sOMnilated atsup yess eer 1, morionides, Chaud. 
Joints of hind and middle tarsi oy Qincisitee,... sodebvoscesee 2. tarsalis, Lec. 
Posterior tarsi slender, first joint with two grooves and an intervening ridge on the out- 
er side; prosternum (except in P. planctus,) strongly margined behind; base of pro- 
thorax margined towards the sides. 
Sides of prothorax crenato-dentate. 
Prothorax feebly narrowed behind, basal foveze large, bistriate, elytra 
OPewyie, Claepllyy SUMAN, WS. os cacssbachs~ 3. crenicollis, Lec. 
Sides of prothorax entire, not serrate: é 
Prosternum scarcely margined behind: 
Outer basal stria of prothorax distinct, humeri not dentiform., 
4. planctus, Lec. 
Prosternum distinctly margined behind: 
Prothorax feebly narrowed behind, and slightly sinuate on the sides, hind an- 
gles rectangular: 
Humeral angles dentiform. 
Hind angles of prothorax distinctly carinate, outer basal stria long. 
5. herculaneus, Mann. 
Humeral angles not dentiform; sides of elytra more rounded near the base. 
Base of prothorax not depressed near the angles, outer stria a feebly im- 
PLESSECMOVCAM nua E REAA «Seer. a Pees benno sy elblsh ris, Ilse 
base of prothorax flattened, more narrowed, outer stria short feeble, gen- 
Cralponmenmorerelonvatess. - - Seeiiart- irene "i. protractus, Lec. 
Base of prothorax less flattened; outer stria vague or wanting, side of pro- 
thorax oblique, scarcely sinuate behind; sides of elytra more parallel 
than in vafadus. 
Scutellar stria distinct (as in the other species of the group): 
8. vicinus, Mann. 
Scutellar stria very short; form narrower.......... 9, longulus, Lec. 
Prothorax scarcely narrowed behind, outer basal impression very short, humeri 
not dentiform, body small, narrow, sides of elytra parallel. 
10. angustus, De]. 
Prothorax a little more narrowed behind, flattened at the base, sides scarcely 
subsinuate, hind angles rectangular, feebly explanate, inner basal stria long, 
outer one nearly obsolete; humeri dentiform. 
Scutellar stria short: 
Elytra with a purple reflection...... ....... » 11. amethystinus. De). 
Elytra piceous or brownish black................ 12. castaneus, De). 
Scutellartstialone.icolomblack.mwmas os. . 0... 13. scutellaris, Lec. 
Bull. Brooklyn Ent. Soc., June 1882, Vol. V. 
