14 LE CONTE.— COLEOPTERA OF THE 



The columns headed A contain genera found in the central desert region of Kansas, New Mexico, Upper 

 Texas, and Arizona, and do not extend into the Atlantic region proper. Those headed B therefore con- 

 tain the genera peculiar to the maritime Pacific slope. 



The genera in the above table which are found in the Atlantic States are: 



In Russian America. — Pristodactyla ?, Epiphanis. 



In Oregon. — Haplochile, Ligyrus, Diplotaxis, Dichelonycha, Canthon, Alaus, Asaphes, Nosoderma, Blapsti- 

 nus, Desmocerus, Tetraopes, Saxinis, Microrhopala. 



In California. — Diaphorus, Thalpius, Lachnophorus, Casnonia, Axinopalpus, Pasimachus ? Ligyrus, Cremas- 

 tochilus, Diplotaxis, Dichelonycha, Perothops, Monocrepidius, Melanactes, Nosoderma, Blapstinus, Tetraopes, 

 Chlamys, Saxinis, Diabrotica, Microrhopala. 



A remarkable fact is again to be noticed in connection with the genera mentioned 

 as found in the Atlantic States : the majority of them are found within the tropics. 

 The only exceptions thus far are : Haplochile, Thalpius, Axinopalpus, Epiphanis, 

 Perothops, Asaphes, Melanactes, Desmocerus. 



DESCRIPTION OF NEW SPECIES. 



Harpalus impotens, piceo-niger, oblongus, thorace transverso, lateribus rotundatis, margine angusto 

 refiexo, angulis posticis rotundatis, basi utrinque vage foveato, versus angulos subdepresso, elytris ad 

 marginem subtiliter pubescentibus, striatis, striis 2, 5, 7 parce punctatis, interstitiis fere planis, epi- 

 pleuris ano pedibusque piceis, antennis palpisque rufo-piceis. Long. -38. 



A specimen found at El Paso by Dr. T. H. Webb, of the Boundary Commission. 

 This species is narrower than H. (Selenophorus) s tigmosus, and iripennis, 

 and readily recognized by the rounded angles of the thorax, and the smaller elytral 

 punctures. 



Pasimachus valid us, niger nitidus, margine vix cyanescente, mandibulis rugosis, thorace transverso 

 postice angustato, lateribus anguste marginatis ad basin sinuatis, angulis posticis rectis ; elytris ovatis 

 postice acutis, lateribus parum rotundatis, humeris obtusis (praecipue distinctis) subrotundatis, et breviter 

 carinatis, dorso convexis, antice prsecipue depressiusculis, ssepe seriatim punctulatis, (seriebus per paria 

 approximatis ;) tarsis posticis tibiis haud longioribus. Long. 1-12 — 1*43. Tab. IV. fig. 10. 

 Pasimachus punctulatust Lee. Ann. Lye. Nat. Hist. New York, 4, 146; tab. 7, fig. 3. 



Kansas, Texas, Arizona ; abundant. Having a numerous series of specimens before 

 me, I am led to believe that the characters of this species are by no means constant, 

 and it seems probable that the form of the elytra must be disregarded, and the very 

 short humeral carina, and the comparative length of the posterior tarsi be considered 

 alone as diagnostic. In this case the next species will appear as only an individual 

 variety, although the differences in form are such that I can hardly believe it possible. 

 The posterior tibiae, on the inner surface below the middle, are in the male densely, 

 in the female sparsely clothed with erect hairs. On account of this character, and its 

 general resemblance to P. depressus, I was formerly led to believe this to be 

 P. punctulatus Hold., but the type of that species has since been kindly pre- 

 sented to me, and on comparison I find them quite distinct ; the humeral carina of 

 P. punctulatus is longer and the margin is distinctly blue ; it in fact differs from 



