56 [April 



insect is always winged, and at San Diego, in June, occurred in such numbers, 

 flying in the twilight, as to be very troublesome. 



54. P. variolatus, aeneo-niger, thorace latitudine breviore, rotundato, mar- 

 gine tenui reflexo, basi utrinque late minus profunde foveata, elytris thorace 

 duplo latioribus, tenuiter striatis, punctis 5 7 maiusculis impressis, aeneo-pieeis, 

 margine late pedibusque flavo-testaceis, antennis nigro-piceis, articulo lmo rufo. 

 Long. -25. 



Lee. Ann. Lye. 5, 178. 



San Francisco, California; under bark of dead trees. The four anterior of the 

 elytral punctures are placed on the third, the posterior three, or two (as the case 

 may be) are adjacent to the second stria. In one specimen there are only three 

 punctures on the third stria, the other four being on the second. The basal im- 

 pressions do not combine with the concavity near the margin (as in P. placidus) 

 but remain distinct. 



Mr. Motschulsky (Bull. Mosc. 1845, pars 1, 21,) has mentioned a species 

 under the name Agonum limlatttm, which may be identical with our insect. He 

 merely states, " in size and form it resembles closely A. p e 1 i d n u m, but is 

 readily distinguished by the whitish margin of the elytra." The specific name 

 is, however, preoccupied by Say. 



H k. 



A group containing species of a robust form, but flattened body ; the color is 

 more or less metallic ; the legs and antennae dark colored or black ; the thorax 

 has the posterior angles somewhat distinct, but not prominent; the margin is 

 very narrow, but not reflexed; the basal impressions are shallow and prolonged 

 anteriorly. The elytra are scarcely one half wider than the thorax, emarginate 

 at base, very slightly sinuate at the tip ; the striae are well marked, but fine ; the 

 third interval has from five to seven punctures. 



55. P. deplanatus, aeneus, virescens, modice elongatus, thorace rotundato- 

 quadrato, tenuiter marginato, latitudine breviore, postice parum angustato, basi 

 truncato, utrinque sat profunde impresso, angulis posticis obtusis, haud rotun- 

 datis, elytris fere depressis, thorace vix sesqui latioribus, oblongis, tenuiter 

 striatis, 6-punctatis, antennarum articulo lmo pedibusque piceo-aeneis. Long. 

 3845. 



Agonum deplanatum Menetries, Bull. Petrop. 2, 58. (1844.) 

 Abundant at San Jose. The original description mentions that the striae of 

 the elytra are finely punctulate ; this character may be observed in some speci- 

 mens, but is usually not apparent. The basal impressions of the thorax are 

 sometimes very obsoletely punctulate ; the punctures of the third interval of 

 the elytra are not adjacent to either stria. 



56. P. f o s s i g e r, niger, vel aeneo-niger, thorace rotundato-quadrato, tenuiter 

 marginato, postice subangustato, basi late rotundata, utrinque longius impressa, 

 angulis posticis obtusis subrotundatis, elytris paulo convexis, (feminse opacius- 

 culis) thorace vix sesqui latioribus, oblongis, striis fere impunctatis, interstitiis 

 parum convexis, 3io punctis 5 7 maiusculis impressis. Long. '3538. 



Agonum fossiger Dej. Sp. Gen. 3, 160. 



Anchomenus fossiger Mann. Bull. Mosc. 1843, 199. 



California, at San Francisco, San Jose, San Diego, and the Colorado River. 

 Varies not only in color, but even in form ; the thorax is usually distinctly wider 

 than long, and considerably rounded on the sides ; the basal impressions are 

 broad and obsoletely prolonged anteriorly to the middle, and occasionally slightly 

 punctulate. 



a. This is a single specimen from San Francisco, in which the thorax is not 

 wider than long, almost square, and less rounded on the sides than in the other 

 specimens, but with the posterior angles less distinct and more rounded. The 

 general form of the body is narrower, but as I have not found the characters 

 sufficiently distinct, it would be imprudent for the present to separate it under 

 another name. 



