COTINIS. 345 



COTINIS. 



Cotinis, Burmeister, Handb. der Ent. iii. p. 254 (1842) . 

 Latemnis, Thomson, Le Naturaliste, i. p. 268 (1880). 

 Balsameda, Thomson, loc. cit. 



The species with emarginated clypeus and long spiniform teeth at the apex of the 

 four hind tibiae (genera Amithao and Lesicasta) being withdrawn, this genus is here 

 left as defined by Burmeister. It includes about twenty species distributed throughout 

 the tropical and north temperate zones of America, and distinguished by having the 

 same armature of the head in both sexes, namely an erect clypeal horn often much 

 reduced, until in the aberrant forms it consists of a barely perceptible median elevation 

 of the reflexed apex of the clypeus, and a horizontal frontal horn, which likewise is 

 sometimes partly atrophied, but in the most aberrant species is visible as a tolerably 

 distinct central carina. The genus Latemnis of Thomson I consider as certainly 

 congeneric with Cotinis, but Balsameda is rather better defined, consisting of those 

 species in which the external posterior angles of the hindmost coxse are obtuse and not 

 acutely produced as in the rest of the genus ; the armature of the head remains, 

 however, normal, and I think it advisable to retain it as a section of Cotinis. 



I. Coxce jposticce angulis jposticis subfalcato-productis. 



1. Cotinis laticornis. (Tab. XXII. figg. 6, 6 «, $ .) 



C. barthelemyi aflmis. Subelongato-oblonga, thorace quam in O. mutabili postice multo angustiore ; cornu 

 clypeali apice late dilatato et tridenticulato, dente intermedio obtuso, cornu horizontali frontali apice longe 

 libero et recte porrecto. Caput, thoracis margine lato (et interdum linea angusta dorsali), epimeris 

 corporeque subtus viridi-metallicis, nitidis, elytris velutinis fusco-purpureis vel fusco-fulvis versus suturam 

 viridi-obscuris ; thorace disco viridi-velutino, margine nitido, rugoso-punctato ; pygidio sparsius quam in 

 C. mutabili transversim striguloso ; pectore, ventris lateribus et tibiis 4 posticis intus fulvo-rufb pilosis. 

 Tibiae 4 posticae medio extus carina denticulata, apice late et obtuse dentatae ; anticaa <$ apice extus valide 

 dentatse, supra biflexuosae interdum unidentatae, § bidentatae. Processus sternalis latus, planus, parte 

 mesosternali fere sicut in O. mutabili, sed paullo angustiore. 



Long. 27-35 millim. ; lat. thor. basi 10-13 millim. S 2 • 



Hob. Mexico, Sonora {coll. Bates), Villa Lerdo in Durango, Tupataro in Guanajuato 

 {Hbge), Guanajuato {Salle), Mexico city {Dr. Palmer, Flohr). 



A good number of examples of both sexes, in all of which the clypeal horn is greatly 

 dilated at the apex and more or lpss distinctly tridentate. This character, added to the 

 tawny or rich purple-brown colour of the elytra, distinguishes the species well from 

 C. barthelemyi of Colombia. 



We figure an example from Mexico city. 



biol. cbnte-amee., Coleopt., Vol. II. Pt. 2, March 1889. 2 YY 



