50 SEKKICOKXIA. 



1. Omochyseus terminalis. (Tab. IV. fig. 5.) 



Ornochyseus terminalis, C. O. Waterh. Trans. Ent. Soc. Lond. 1887, p. 183 \ 



Niger, vix purpurascens ; pectore abdomineque cyaneis, pedibus cupreis : capite profunde excavato ; thorace 

 transverso, crebre sat fortiter punctato, disco excavato, antice guttis duabus elevatis punctatis instructo : 

 elytris sicut griseo-marmoratis, hie et illic seneo-tinctis, confertim punctulatis, guttis numerosis irregu- 

 laribus parum elevatis nitidis, fascia post medium nigro-velutina, apice inclinato, cyanescente, transverso, 

 trapezoidali. 



Long. 6 lin. 



Hah. Mexico, Oaxaca 1 {Salle). 



This insect chiefly differs from the Brazilian 0. humeral/is in having the apex of the 

 elytra rather more expanded. 



ENGYAULUS. 



General characters of Agrilus. Sockets of the antennse round, and separated from 

 each other by a very narrow space (Tab. IV. fig. 9 b). Front of the head (when viewed 

 from the side) very prominent and regularly arched (fig. 9 a). Basal joint of the 

 posterior tarsi short. 



I propose this generic name to include Agrilus pulchellus, Bland, and a closely allied 

 new species. 



1. Engyaulus pulchellus. (Tab. IV. figg. 9, 9 a, b.) 



Agrilus pulchellus, Bland, Proc. Ent. Soc. Phil. iv. p. 382 (1865) l . 



Bab. North America, Colorado (J. Hidings 1 ). — Mexico, Northern Sonora 



(Morrison). 



2. Engyaulus rubrovittatus. 



Elongatus, parallelus, rugosus, seneus, subtus pube brevi griseo-alba dense vestitus ; capite longitudinaliter 

 fortiter impresso ; thorace parallelo, convexo, medio leviter canaliculato, angulis posticis prominulis ; 

 elytrorum sutura apiceque viridibus, lateribus cupreo-rubris. 



Long. 9-11 lin. 



Hah. Mexico, Guanajuato (Salle). 



Var. elytrorum sutura apiceque violaceis. 



Hah. Mexico, Oaxaca (Brit. Mus.). 



This species resembles E. pulchellus in general appearance, but differs in many 

 points. The head and thorax are rugulose and punctured ; the rugae on the raised 

 parts of the forehead are longitudinal but wavy. The rugse on the thorax are trans- 

 verse, and more regular than in E. pulchellus. The thorax is more evenly convex, 

 with scarcely any trace of lateral impression ; the sides are nearly rectilinear ; the 

 discoidal impression is not deep, but distinct, and is less interrupted in the middle. The 

 elytra are closely and rather coarsely granular ; the green (or violet) colour of the 



