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DISCODEEUS. 



63 



(like the edge of the tibiae) with short spinules without admixture of setse. The 

 middle tibise are curved, in some of the species to an extraordinary degree. The 



elytra, as in Selenophorus, have three rows of punctures. 



1. Discoderus arcuatus. 



Selenophoi'us arcuatus, Putzeys, Stett. ent. Zeit. 1878 (Jan.), p. 71 \ 

 Selenophorus amblyderus, Bates, Proc. Zool. Soc. 1878 (May), p. 591 2 . 

 Discoderus cyanellus et tristis, Chaudoir in coll. 



Hab. Mexico 1 , near the city (Flohr 2 , Salle), Toluca, Guanajuato (Salle), San Luis 

 Potosi, Sierra de San Miguelito (Br. Palmer), Jalapa, Las Vigas (Edge). 



Having examined a large number of specimens apparently of both sexes, I find none 

 with anterior tarsi clothed with squammules beneath. The middle tibiae are faintly 

 curved in what I take to be the male. 



2. Discoderus piger. 



Robustus, elongato-oblongus, convexus, niger nitidus, cseruleo vel violaceo leviter tinctus, subtus thoracis 



marginibns elytrorumque epipleuris ssepe piceo-rufis, pedibus interdum piceo-rufis, labro, palpis et 

 antennis piceo-fulvis ; thorace magno, convexo, ovato, subquadrato, elytris vix angustiore, lateribus 

 arcuatis, sed antice quam postice citius angustato, angulis anticis deflexis apice obtusis, posticis rotun- 

 datis, sulco marginali versus basin dilatato plus minusve explanato ; elytris versus apicem oblique 

 sinuatis, dorso grosse et profunde striatis, interstitiis convexis, punctis seriatis eonspicuis in striis 2% 5 a 



et 7 a sitis. c? $ 

 Long. 51-7 lin. 



■ * 



Hab. Mexico, Oaxaca (Salle, Hoge). 



Named by Chaudoir piger in the Salle collection, and tenuimargo in his 



3. Discoderus difformipes. 



Paullo angustior, robustus, elongatus, convexus, niger cyaneo tinetus, palpis, antennis et tarsis piceo-rufis ; 

 thorace minus ovato, oblongo, lateribus parum arcuatis, angulis anticis eonspicuis, rectis, lateribus versus 

 basin cyaneis ; elytris postice paullo angustatis, ut in D. pigro grosse et profunde striatis, punctis seriatis 

 minus eonspicuis ; tibiis anticis apice extus paullo dilatatis. intermediis gracilibus f ortissime angulatim 

 curvatis ; trochanteribus posticis valde elongatis, apice subacutis. 



Long. 6| lin. $ . 



Hab. Mexico, Guanajuato (Luges, coll. Salle). 



Closely allied to B. piger, but effectively distinguished from it by the longer, thinner, 

 and much more strongly incurved middle tibiae. In D. piger (male) these are strongly 

 bowed, but not abruptly curved or bent, except close to the apex ; in B. difformipes 

 they are bent at almost an obtuse angle near the middle. 





4. Discoderus distortus. (Tab. III. fig. 21.) 



Elongato-oblongus, parallelogrammicus, convexus, supra seneus, capite thoraceque plus minusve cyaneis, labro, 

 palpis, antennis elytrorumque epipleuris fulvis, thoracisque margine corporeque ssepe piceo-fulvis ; thorace 

 quadrato antice dilatato, sed interdum ut in D. difformipecle subovato lateribus regulariter modice arcuatis, 















