22 Mr. G. C. Champion's Revision of the Mexican 



Malachius paradoxus, Sturm, in litt. 



Bluish-black, the anterior margin of the head broadly in (J, and 

 narrowly in $, the labrum and clypeus, the bases of the palpi and 

 mandibles, the antennae with joint 1 in both sexes, 2 in great part 

 above, and 3 and 4 along their outer edge, in (J, 2-4 along their outer 

 edge in $, the prothorax and abdomen, rufous or testaceous, the rest 

 of the head and the elytra violaceous or blue ; clothed with fine cine- 

 reous pubescence intermixed with very long, erect, black hairs, the 

 adpressed cinereous pubescence on the head long and conspicuous in 

 (J, more scattered in $. Head broad, densely, finely pimctate; 

 antennae ((J) with joint 1 very broad, abruptly expanded from near 

 the base externally, oblong-subquadrate, concave above, 2 with a 

 very long, slender, curved appendage, 3-9 moderately serrate, 3 

 a little wider than 4, (?) 1 oblong-conic, 2 broad, large, rounded 

 within, 3-5 transverse, serrate. Prothorax strongly transverse, 

 somewhat rounded in front, shining, sparsely, minutely punctate. 

 Elytra densely, rather coarsely punctate, bluntly rounded at the apex. 



Length 4|-5|, breadth 2|-2i mm. (<??.) 



Hab. Mexico, {ex coll. Sturm), Oaxaca {Salle, Hoge), 

 Parada {Salle), Mochitlan in Guerrero {Baron), Omilteme 

 and Xucumanatlan in Guerrero {H. H. Smith). 



Apparently a common insect in Oaxaca and Guerrero, 

 whence a long series has been received showing no variation. 

 Erichson's description of this species was taken from a 

 single Mexican example ($) found by Deppe. The 

 gynandromorphous $ from Oaxaca figured by Gorham 

 belongs here. C. paradoxus is extremely like C. frontalis, 

 Gorh., also from Oaxaca ; but differs from it in the male sex 

 in having a densely punctured, more pubescent head, with the 

 testaceous coloration less extended, not reaching the eyes, 

 the first antennal joint concave, and very broadly dilated 

 from near the base, and the second joint with a still longer 

 appendage. The females of the two forms are not easy to 

 separate ; but that of C. paradoxus may be identified by the 

 shghtly longer prothorax, and the less dilated, wholly pale 

 first antennal joint. C. tricolor is a smaller insect, with less 

 coarsely punctured elytra, and a non-appendiculate second 

 antennal joint in (^. 



5. Collops frontalis. 



Collops frontalis, Gorh., Biol. Centr.-Am., Coleopt. iii, 2, 

 p. 314. 

 (J. Antennae with joint 1 wholly testaceous, gradually narrowing 



