AETEMATOPTJS. 587 



form in the two groups ; in one of the species of the second group they are clothed on 

 all sides with long bristles, like a bottle-brush. The prosternal process is similarly 

 formed in the species here described. The females of some of them are much larger 

 than the males. These insects are found upon bushes in dry places, chiefly on the 

 savanas of the " tierra caliente." 



a. Antenna; about reaching the middle of the elytra in the males, very little shorter 



in the females, filiform, or slightly tapering towards the tip, joint 3 twice as 

 long as 2 in both sexes. 

 a!. Elytra very coarsely punctate-striate throughout, usually with black spots, 



which are sometimes coalescent irroratus. 



V. Elytra more finely punctate-striate on the disc than at the sides. 



a". Prothorax thickly punctured ; elytra with an oblique black stripe extending 



from the shoulder to near the apex obliguus, 



b". Prothorax very sparsely punctured ; elytra in great part black scapularis. 



b. AntemiEe as long as or longer than the body, and with joints 2 and 3 very small 



and subequal, in the males, much shorter, and with joint 3 considerably longer 

 than 2, in the females. 

 c'. Antenna? with the joints from the fourth slightly concave without and some- 

 what dilated towards the tip within, clothed with long fine hairs. 

 c". Prothorax gradually narrowing from the base, feebly rounded at the sides ; 

 antennae about reaching the middle of the elytra in the female. 



a'". Prothorax densely punctate puncticollis. 



b'". Prothorax sparsely punctate rufescens. 



d". Prothorax rapidly narrowing from the base, thickly punctured ; antennae 



comparatively short in the female costaricensis. 



e". Prothorax rounded at the sides, coarsely, closely punctate ; antennas about 



reaching the middle of the elytra in the female rotundicollis. 



d'. Antennae with the joints from the fourth straight without and a little dilated 



towards the tip within, clothed with very long bristly hairs seticornis. 



1. ArtematopUS irroratUS. (Tab. XXVI. figg. 1, 6; la, antenna; 1 b, 



genitalia.) 



Oblong-oval, convex, shining ; head, prothorax, and scutellum rufo-testaceous or rufo-castaneous, the sides of 

 the prothorax testaceous or flavo-testaceous ; the elytra testaceous, each with a transverse mark on the 

 disc a little below the base, two marks at about one-third from the apex (placed transversely, one on tbe 

 disc and one at the side), a small spot on the disc below these, and sometimes another at the shoulder, black 

 or piceous, these markings sometimes partly or entirely obliterated ; the antennae ferruginous, the legs 

 testaceous, the body beneath castaneous or ferruginous, the metasternum darker ; rather sparsely clothed 

 with yellowish-cinereous pubescence, the upper surface with long erect hairs intermixed. Head thickly, 

 finely punctate ; antennas slender, filiform, becoming a little thinner towards the tip, about reaching to 

 the middle of the elytra in the male, a little shorter in the female, joint 3 more than twice as long as 2, 

 all the joints sparsely clothed with long fine hairs. Prothorax strongly transverse, moderately convex, 

 acutely margined and a little explanate at the sides, the latter gradually, arcuately converging from the 

 base forwards, the apex feebly emarginate on either side ; the surface thickly and somewhat coarsely 

 punctate with indications of a smooth median line. Scutellum obsoletely carinate. Elytra moderately 



4P2 



