20 



GENUS CEPHALOCOEMA, SERVILLE. 



TABLE FOR SEPARATION OF THE SPECIES. 



A. Rostrum of the vertex scarcely as long as or but little longer than 

 balance of head. Protonnm punctulate or smooth. Tibite above 

 on both sides with not more than sixteen spines, 

 b. Rostrum of the vertex much shorter than the remainder of head. 

 Abdomen tive-ridged. costulata Burm. 



bb. Rostrum of the vertex distinctly shorter than or but little longer 

 than remainder of head. Abdomen not tive-ridged. 

 c. More robust: rostrum pyramidal, acuminate, viewed from the 

 front narrowly lamellate. Antenn;e of female greatly surpassing 

 the rostmm. Borellii Giglio-Tos. 



cc. More slender: rostrum with the sides parallel, 

 d. Rostrum linear, obtuse, viewed from the front narrowly cruci- 

 form. Attenn.-e of female a little surpassing the rostrum. 



Caizana Giglio-Tos. 



dd. Rostrum quadrangular, obtuse, as long as (female) or longer 



(male) than the rest of head. oalainus Burm. 



AA. Rostrum much (two or more times) longer than the remainder of 



head 



b. Protonum longer than the head. 



c. Protonum with the anterior margin not tuberculate. 

 d. Rostrum less than twice the length of remainder of head, mod- 

 erately dilated toward the apex. obtiisa Giglio-Tos. 

 dd. Rostrum fully twice as long as remainder of head, strongly 

 dilated toward the apex. niag'iia Giglio-Tos. 

 cc. Pronotum with the antei-ior margin bituberculate. 



gigantea Giglio-Tos. 

 bb. Protonum shorter than the head. 



c. Rostrum less than four times as long as remainder of head, 

 d. Rostrum a tritle more than twice as long as remainder of head: 

 the anterior femora about two-thirds as long as pronotum. 



teretitiscula Brunner. 

 dd Rostrum three times as long as remainder of head: the ante- 

 rior femora a trifle longer than the pronotum. 



lancea Burm. 

 cc. Rostrum more than four times as long as remainder of head. 



liiieata Brunner. 



Fig. 6. — Cephaloeoema costulata.: female. 



C. costulata Burm. This species which occurs over the 

 greater part of the Republic north of tlie Rio Colorado is 

 quite variable in color. (Collections of Stempelmann, 

 Schulz, O. Thomas and others.) 



