1854.] 221 



rendered irregular internally by two slight and obtuse teeth near the tip ; it is 

 also prolonged around the apical margin to the suture ; the tip of each elytron 

 is slightly rounded, and the margin is not serrate. 



Melanotus e r r o , nigro-piceus, nitidus, mandibulis fortiter rugosis, thorace 

 capite cum oculis haud latiore, latitudine fere triplo breviore, postice angustato, 

 angulis posticis obtusissimis valde rotundatis tenuiter canaliculato, lateribus 

 rotundatis anguste marginatis, basi utrinque late impresso alutaceo, elytris 

 ihorace haud latioribus strii3 profundis impunctatis, interstitiis fere planis, an- 

 itnnis palpis pedibusque rufo-testaceis. Long. -57. 



One specimen, " San Diego trip." This species, the second discovered in North 

 America, is considerably larger than A. scaritides Chaud. [Cratognathus scar. 

 Perty, Amblynathus niger Gray.) which it otherwise closely resembles in general 

 characters. 



Acilius maculatu s, ovalis, paulo convexus, infra ferrugineus, supra niger 

 nitidus, capite ante oculos, maculaque transversa verticaii flavis, thorace lateri- 

 bus fasciaque angusta postice concava ad medium interrupta flavis, elytris mar- 

 gine maculis tribus annexis, alterisque disci (quarum una ad medium prepe su- 

 turam multo maior) laete flavis, pedibus anterioribus testaceis. Long. -55. 



Fem. striolis a basi ad quadrantem elytri singuii extensis. Mas latet. 



One specimen from the Copper mines. In this beautiful species there is a 

 complete absence of the small anastomosing spots seen in our other native spe- 

 cies. The ground color above is black with well defined bright yellow spots : 

 those of the head consist as usual of the anterior part, and the transverse verti- 

 cal spot, which is emarginate anteriorly. The thorax has the sides broadly yel- 

 low, and two narrow discoidal spots running obliquely outwards and backwards, 

 so as to form a fascia concave behind and interrupted at the middle. The spots 

 of the elytra consist of a yellow margin extending nearly to the tip ; joined to it 

 are three spots, the first extending from the base almost to the middle, undulated 

 internally and. suddenly dilated at it3 posterior extremity, as if by the addition 

 of a small spot ; the second is quadrate and placed about the second third ; the third 

 is at the tip of the yellow margin and is subtriangular, with the apex directed an- 

 teriorly : there are besides on each elytron two basal spots, the outer of which is 

 elongated ; two small quadrate spots at the anterior fourth ; a large rounded one 

 about the middle and near the suture ; a smaller one still nearer the suture at 

 the posterior fourth, and a small one very near the apex. A small yellow dot 

 may be seen between the two basal spots, but is perhaps sometimes wanting: 

 the surface i3 nearly smooth ; the usual series of punctures are distinct, and 

 from the middle of the base of each elytron to the large spot are scattered a few 

 short strise as in the females of other species. 



Dineutes integer, oblongo-ovalis dorso convexiusculus, supra niger subaenes- 

 cens, minus nitidus ; elytris obsolete punctatis tenuiter obsolete striatis, postice 

 coniunctim rotundato-truncatis, vix undulato-emarginatis, subtus niger, pedibus 

 posticis picescentibus. Long. -61. 



One specimen from the Copper mines. From D. vittatus, which it equals in 

 size, this species is at once distinguished by the tips of the elytra being conjointly 

 broadly rounded, so as to leave no apparent angle at the suture. 



Stethoxus subsulcatus, elongato-ovalis, convexus, utrinque attenuatus, 

 olivaceo-niger, nitidus, thorace trapezoideo, latitudine plus duplo breviore lateri- 

 bus vix rotundatis, basi late emarginato, angulis posticis apice rotundatis, ely- 

 tris obsolete sulcatis, sulcis utrinque obliteratis, lineisque punctorum solitis 

 tribus notatis ; antennis palpisque ferruginei3. Long. 1.25, lat. *65. 



At Camp 7. Still narrower than S. triangularis (Hydrophilus triangu- 

 laris Say), and readily distinguished by the broad indistinct furrows of the ely- 

 tra: the furrow next the suture can hardly be seen. 



Plusiotis glorio sa supra leete psittacina, clypeo punctulato margino sub- 



