352 SEEEICOENIA. 



would appear to be nothing more than a small variety ; but differing from that insect in 

 having the thorax considerably shorter in both sexes. It is equally variable in colour. 

 The punctures of the thorax are unequal in size. The genitalia of the male are formed 

 very much as in M. vespertinus ; the outer lobe is curved outwards and truncated at 

 the tip, the apical margin armed with three or four short teeth. A specimen from 

 Teapa is figured. 



24. Monocrepidius aversus. 



Monocrepidius aversus, Lee. Trans. Am. Phil. Soc. x. p. 482 (1853) ] ; Cand. Monogr. Elat. ii. 

 p. 259 s . 

 Eab. North America, Georgia 1 2 .— Mexico, Ventanas in Durango (Forrer), Jalapa, 

 Tapachula (Edge), Oaxaca (Salle), Teapa in Tabasco (//. E. Smith) ; Guatemala 

 (Salle), Aceituno (Salvin, Champion), Chacoj and San Geronimo in Vera Paz, Guatemala 

 city, Capetillo, Zapote, Eio Maria Linda, Champerico (Champion); Costa Kica, Cache, 

 Volcan de Irazu (Bogers). 



This is a common insect in Central America. The colour of the thorax and elytra 

 is variable, but the scutellum is always flavous or rufous ; the thorax has the hind 

 angles, or the entire base, and sometimes a narrow median line or marginal stripe, of 

 this colour ; the elytra are usually brown or pitchy-brown, but they sometimes have a 

 broad submarginal vitta or |-shaped mark testaceous. The thorax is a little longer in 

 the male than in the female, and is densely, finely punctate, sometimes with a few 

 scattered slightly coarser punctures intermixed, these becoming a little more distinct 

 at the sides. I have seen upwards of seventy specimens of M. aversus, including 

 several from the United States. In the single example from Champerico, on the 

 Pacific coast, the thorax has numerous distinct intermixed coarser punctures, this 

 specimen approaching M. tumidicollis, from the Atlantic coast. 



25. Monocrepidius bipustulatns. (Tab. XV. fig. 17.) 



Moderately elongate, rather convex, slightly shining ; piceous or brown, the hind angles of the prothorax, the 

 scutellum, and a large spot on the outer part of each elytron near the apex, flavous or testaceous, the 

 head in front, a line down the middle of the prothorax, and sometimes the lateral margins also, ferruginous 

 or testaceous ; the antennse testaceous, the legs flavous ; the surface thickly clothed with a fine, silky, 

 yellowish-cinereous pubescence. Head convex, closely, very finely punctate, the frontal carina rounded 

 and not prominent ; antennae moderately elongate, joint 3 slightly longer than 2, the two together about 

 the length of 4. Prothorax as long as broad, narrowed in front, the sides rounded anteriorly and feebly 

 sinuate behind ; the hind angles broadly triangularly produced, not divergent, finely carinate at the sides 

 above, the carina short, very close to the margin, and extending obliquely inwards in front : the surface 

 densely, very finely punctate, the punctures equal in size. Elytra twice the length of the prothorax, 

 narrowing from about the middle, feebly truncate at the apex ; finely punctate-striate, the punctures 

 distinct throughout ; the interstices feebly convex, thickly, minutely punctate. Beneath densely, very 

 finely punctate. Fourth tarsal joint somewhat broadly lamellate beneath. 



Var. The elytra each with an oblique ferruginous spot about the middle. 



Length 6|-8, breadth 2-2| millim. 



