REMARKS ON THE COLEOPTERA. 21^ 



" fascicollis Harris N. E. Farmer ? erythropterus Aube, 305. 



zonatus ^"° Aube, 214. Colymhetes ery. Say. Am. Tr. 2, 95. 



COLYMBETES Clairvilh. strlatus Aube, 305. 



sculptilis Harris I. c. Colymb. stri. Say. Am. Tr. 2, 97. 



triseriatus Kb. N. Z. 73. Agabus arctus Mels. P. Ac. 2, 27. 



'^binotatus Han: I. c.f "parallelus. 



maculicollis Aube, 245. obtusus. 



agilis Aube, 254. Coiym. obi. Say. Am,. Tr. 2, 99. 



Ilybius Er. nitidus ? Say. 2, 98. 



** pleuriticus. Agabus gagates Aube, 306. 



picipes Kb. N. Z. 71. stagninus. 



Agabus Er. Col. stagn. Say. Am. Tr. 2, 100. 



*•* angustus. Agabus striola Aube', 308. 



^ This species is more narrowed anteriorly than its European analogue, and wants 

 the narrow rufous line at the base of the thorax ; moreover the ? has the external basal 

 portion of the elytra more densely and distinctly punctulate. 



38 I know not whether Dr. Harris' name is published. In case it is, Aube's C. binota- 

 tus (p. 247, a West Indian species) must fall. I have the less hesitation in giving our 

 species as identical with the Mexican C. maculicollis, as I found at the Rocky Mountains 

 numerous specimens, which do not differ from those obtained at the north. Mr. Melly, 

 from actual comparison, also informs me that it is identical. 



'9 I. pleuriticus. — Angustior oblongo-ovalis convexus, postice suboblique attenuatus, 

 supra a;neus, minute reticulatus opacus, capite in vertice binotato, anticeque rufo, elytris 

 pone basin vix dilatatis subparallelis, pone medium gutta oblonga, alteraque versus 

 apicem pallidis, epipleuris pedibusque piceis, vel rufo-piceis. Long. lat. 



Narrower than I. biguttulus, less dilated behind, the sides of the elytra being almost 

 parallel for nearly | of their length, then gradually attenuated to the apex ; the irregu- 

 lar series of points are more distinct behind the middle. 



I. picipes : What I consider as this species is much smaller, narrower and less convex 

 than I. biguttulus, the thorax less abbreviate, somewhat rounded on the sides ; elytra 

 nearly parallel, and less suddenly attenuated at the tip ; the confused rows of points 

 are more distinct. My specimen is immature, and the body is rufo-piceous. 



■'*' A. angustus. — Depressus, anguste ovalis, postice suboblique attenuatus, niger 

 subopacus, capite subtiliter, thorace elytrisque grossiusreticulatis, illo margine anguste 

 depresso, lateribus ante medium rotundatis, angulis posticis acutis subproductis, ore 

 antennis, palporumque basi ferruginei.s. Long. lat. 



Very distinct from its large size and peculiarly shaped thorax. The rows of impress- 

 ed points on the elytra are distinct, and the reticulations become finer at the apex 

 and margin. 



■" A. parallelus. — $ 9 Elongato-ellipticus depressus, niger nitidus subtilissime retic- 

 ulato-strigosus, capite antice vix ferrugineo, antennis palpisque ferrugineis. Long. -38, 

 lat. -2. 



Differs from A. striatus in being more elliptical, the two ends being similarly rounded, 

 and the elytra quite parallel for the greater part of their length ; the head is wider and 

 the thorax less narrowed in front. The reticulations are a little more evident than in 

 that species. 



