AMERICAN COLEOPTERA. 129 



Hind femora one-fourth shorter than the abdomen. Length .50 — 1.10 inch ; 

 13—28 mm. 



Male. — Rostrum and head one-third longer than thorax, basal portion longer 

 than the apical, slightly compressed and near antennal insertion slightly ex- 

 planate, apical portion slender, slightly dilated at apex. First two abdominal 

 segments sulcate, sulcus extending forward on the metasternum nearly to the 

 middle coxae. Hind femur with acute spine at basal fourth, longer than the 

 apical. Hind tibia flattened arcuate, inner edge deeply sinuate and with 

 moderately long hairs. 



Female. — Head and rostrum always equal to, rarely longer than, the thorax, 

 basal portion of rostrum shorter than the apical and in regular cone, apical 

 portion slender and cylindrical. Hind femur with a single spur, hind tibia 

 straight. Abdomen as in the male. 



Resembles B. mexicanus, Sch.,but the dorsal channel of the thorax 

 is very much deeper. In the female of niexicanus there is a spine on 

 the anterior femur only, and the ninth interval of the elytra has no 

 liueole at apes. 



Numerous specimens were collected at Cape San Lucas, Lower Cali- 

 fornia, by John Xantus. 



B. lucauus, n. sp. — Brownish-black, shining. Head obconical, constrict- 

 ed at base. Thorax elongate conical, above depressed and moderately chan- 

 nelled at basal half, surface minutely and sparsely punctulate. Elytra slightly 

 longer than thorax, deeply striate, strise punctured, and with two yellow lines 

 on each arranged as in the preceding species, the inner with a small detached 

 portion at apex and an internal lineole, the outer without external apical 

 lineole. Body beneath as in peninsularis. Anterior femora with small tooth 

 near apex, middle and hind femora mutic, the latter not as long as the first 

 two abdominal segments. Length .40 — .62 inch; 10 — 16 mm. 



Male. — Rostrum and head longer than thorax, basal portion longer than the 

 apical and of slender conical form, apical portion slender cylindrical, feebly 

 dilated at apex. Thorax broadly constricted at middle. Second segment of 

 abdomen with faint sulcus. 



Female. — Head and rostrum not longer than thorax, basal portion short coni- 

 cal, apical slender cylindrical and twice as long as basal. Head broader than 

 in male. Thorax of regular elongate conical form. Abdomen not channelled. 



Resembles anclwrago in the sexual difference in the thorax. The 

 elytra are not appendiculate and not more prolonged in the male than 

 the female. The females of ancfiorago and luca?ius cannot be distin- 

 guished. 



Collected with the preceding at Cape San Lucas, Lower California, 

 by John Xantus. 



The measurement given in all the species includes the entire length 

 from tip of rostrum to apex of elytra. 



TRANS. AMER. ENT. SOC. IV. (17) OCTOBER, 1S72. 



