CERAMBYCHXE 315 



very strongly cuneiform; upper surface very dark and obscure greenish- 

 blue and with dense velvety lustre; under surface bright metallic greenish- 

 blue throughout and strongly shining; legs colored exactly as in the 

 preceding; prothorax similar in form to the two preceding, except that 

 the anterior margin, instead of being prominent and rather narrowly 

 rounded medially, is broadly arcuato-truncate, the surface almost even, 

 densely punctate but with the short black hairs dense and distinct as on 

 the elytra, the latter as in the preceding in form but darker and much 

 more densely black velvety-pubescent, the outer raised line feebly shining; 

 abdomen very gradually and acutely tapering, the notch very broadly 

 parabolic, not so deep as usual; hind femora and tibise as in the preceding, 

 except that the outer contour of the tibise is broadly arcuate in apical 

 half only, becoming straight and gradually converging to the base in 

 about basal half; antennae (cf ) very long, much more than twice as long 

 as the body, or ( 9 ) barely at all longer than the body. Length 40.0- 

 41.0 mm.; width 10.4-10.6 mm.; length of the last antennal joint (cf) 

 27.0 mm. Mexico (Guerrero), Baron. 



I cannot identify either of the last two species with any of the 

 Mexican and Central American forms enumerated by Bates, and 

 therefore conclude that they are present as nondescripts in various 

 collections. 



Dendrobias Serv. 



In this genus of massive shining glabrous longicorns, the species 

 adhere closely to the generic model and are but slightly diversified. 

 Dendrobias is allied closely to Trachyderes, differing only in having 

 elongate mandibles in the male, larger and broader tarsi, and in 

 style or type of ornamentation ; these generic differences might seem 

 rather unimportant but are apparently valid among such very 

 non-plastic forms. Five species seem to be evident as shown by 

 my material as follows: 



Posterior pale spots of the elytra, when not expanded, elongate, subpar- 

 allel and extending from the apex along the median line of each 

 elytron not quite to the middle; third antennal joint wholly black, 

 the antennse more slender and less compressed in both sexes; scanty 

 hairs of the under surface notably long; prosternum of the male 

 densely and strongly, irregularly punctured, with the usual median 

 smooth line sharply denned. Length (cf ,9 excluding mandibles) 

 23.5-26.0 mm.; width 8.5-9.5 rnrn. Mexico (Guerrero). [9 = 

 D. quadrimaculatus Dup.] *mandibularis Serv. 



Posterior pale spots, when in correspondingly reduced stage, not elongate 

 and subparallel but shorter and broadly oval, occupying nearly the 

 entire width of each elytron posteriorly, rounded anteriorly, some- 

 times broadly fused with the anterior subquadrate spots; hairs, on 

 the very limited portions of the under surface on which they appear, 



