AND EASTERN NEW MEXICO. 5 



A. ^riseipennis, elongato-ovalis, parma convexus, reneo-niger, supra dense (feminse fortiter) 

 reticulatus, elytris luteo-griseis base margineque pallidioribus, an tenuis palpisque flavis, pedibus 

 ferrugineis, femoribus nigro-maculatis ; thorace cum elytris angulum baud formante. Long. -36. 



Fort Laramie, one female. Differs from the species of somewhat similar color 

 inhabiting the United States by its more elongate form, gradually tapering both 

 before and behind ; the thorax continues accurately the outline of the elytra. 

 The reticulations are very dense, and somewhat longitudinal, especially at the base 

 of the elytra. The Californian A. lutosus Lee. approaches it very closely, and it 

 may in fact prove to be the other sex of that species, of which I possess at present 

 only males. The form is, however, somewhat narrower. 



A. ObliteratllS, ovalis, elongatus parum convexus, a3neo-niger, nitidus supra snbtilissime, vix 

 conspicue reticulatus, elytris luteo-piceis, marginibus pallidioribus, seriebus puuctorum solitis 

 valde distinctis, ad basin thorace paulo latioribus, antennis palpis tibiis tarsisque anterioribus 

 ferrugineis. Long. '32. 



Fort Laramie, three specimens. The sculpture of the female is hardly more 

 conspicuous than that of the male. It is sufficiently distinguished from our other 

 species by the characters above given. 



A. spilodis, ovalis, aeneo-niger nitidus, parum convexus, vix subtilissime reticulatus, tborace cum 

 elytris angulum baud formante, elytris seriebus solitis distinctis, lineola utrinque submarginali, 

 guttaque subapicali pallidis, antennis palpisque rufis, tarsis anterioribus rufo-piceis. Long. -35. 



Two females, Fort Laramie. Resembles A. ohtusatus, but is less dilated, and 

 differs very much by the reticulation being so minute as to be scarcely visible even 

 with a high magnifier. The spots are not very obvious. 



AlVISOmiERA Brulle. 



A. COrdata, supra feneo-picea, elongato-ovalis depressa, subtilissime reticulata, thorace brevi, 

 postice angustato et lateribus sinuato, elytris thorace vix latioribus, postice non dilatatis; subtus 

 nigra, ore antennis pedibusque rubro-piceis. Long. '45. Tab. II, fig. 3. 



Lec. Proc. Acad. Nat. Sc. VI, 226. 



Santa F<5; Mr. Fendler. Varies in having black feet; the sides of the thorax 

 are strongly rounded in front, and subsinuate behind ; the base is as wide as the 

 apex, the anterior dilatation being produced by the curvature of the sides ; the 

 anterior angles are acute, the posterior ones rectangular. The elytra are very 

 little wider than the thorax, regularly elongate elliptical, with the usual scries of 

 punctures becoming irregular towards the tip. 



By comparing the figure here given with the South American A. histriata Brull<^ 

 (figured in Dejean's Icon. Col. Europe, V, tab. 2-3, fig. 5), it will be seen that they 

 correspond very closely. The middle lobe of the menttmi of our species is broad, 

 short, and very obsoletely sinuate; in the generic description given by Aube, the 

 mentum of A. histriata is said to have the middle lobe slightly prominent in the 

 middle. This character needs confirmation, as it is hardly possible that two 

 species so closely related should differ in this particular. Though distinct in form, 

 this genus is separated from Agabus by very trifling differences. 



