ONTHOPHAGUS. 75 



22. OnthophagUS OrphnoideS. (Tab. V. figg. 20 ; 20 a, side view of head and 

 thorax.) 



Gen. Orphno primo intuitu similis. $? piceo-niger, subnitidus, subtus pedibusque piceo-rufis, subtus sat 

 confertim subruguloso-punctatus ; clypeo bidentato, dentibus sejunctim a clypei margine elevatis ; fronte 

 carinata, vertice bituberculato ; tborace dorso anteriore prof made eoncavo spinaque valida ad medium 

 marginem anticum ; elytris sat profunde striatis, striis confertim crenatis. 



Long. 7-10 millim. 



Bab. Panama, Volcan de Chiriqui 2500 to 4000 feet {Champion). 



Three examples, all of the same sex, and, judging from the broad anterior tibiae, the 

 frontal carina, and sculpture of the clypeus, females. The teeth of the anterior tibise 

 are long and robust, the two nearest the apex much nearer to each other than to the 

 others, the apex obliquely truncated. The head is rather short ; and the outline of the 

 gense and clypeus together forms a semicircle, except for the two triangular apical teeth 

 which rise obliquely upwards separately and direct from the margin. The tubercles 

 of the vertex are stout, elevated and transverse, each forming a very short and much 

 elevated carina : these lie much nearer the anterior carina than the usual position of 

 the hind carina of the females in the genus Onthophagus. The anterior cavity of the 

 thorax extends from the fore margin to beyond the middle, and narrows posteriorly : it 

 is smooth at the bottom and the ridge that bounds it on each side is compressed and 

 sharp in the middle, showing that the structure is but an exaggerated modification of 

 the antero-dorsal tubercles of both sexes in the 0. rhinolophus group. We have here, 

 however, an additional armature in a robust horn or spine, rising, slightly curved 

 upwards and backwards, from the middle of the anterior margin of the thorax. 



23. OnthophagUS landolti. (Tab. V. figg. 21, <? ; 21 0, side view of head and 

 thorax.) 

 Onthophagus landolti, Harold, Stett. ent. Zeit. 1880, p. 34 \ 



Hah. Mexico, Milpas (Forrer), Orizaba, Tuxtla (Salle), San Juan Bautista, Aguas 

 Calientes, Yautepec, Villa Lerdo, Tonila, Oaxaca, Jalapa (Hbge) ; Guatemala, near the 

 city, Zapote, Mirandilla, Pantaleon, El Tumbador, San Joaquin, San Geronimo (Cham- 

 pion) ; Nicaragua (Salle) ; Costa Eica, Cache (Rogers) ; Panama, Volcan de Chiriqui 

 (Champion). — South America, Colombia \ Venezuela 1 . 



This species may be considered the type of a distinct group of the genus (including 

 the six following) in which the head in the male is unarmed and smooth on the 

 surface ; the armature of the thorax restricted to one or more short lobular prominences 

 near the fore margin ; and the anterior tibiae of the male greatly elongated, with pro- 

 duced inner apex, within which is a long pencil of hairs. 0. landolti varies much in 

 colour : the elytra are most frequently dark brassy-brown, with pale reddish spots at the 

 shoulders and apex; but the reddish colour is sometimes extended, and an extreme 

 variety occurs near the city of Guatemala in which the elytra are wholly tawny-brown. 



LL2 



