316 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Forma typica. — Sierra Lagima and La Chuparosa. 



Forma oblonga. — San Francisqiiito. 



Rei/iarks. — Tlljialis has been heretofore ^Yrongly identified, and un- 

 recognized as a distinct species. The following will correct the 

 erroneous report as given by Doctor Horn." The specimens Avere in 

 the collection of the academy, but were destroyed in the recent con- 

 flagration (April 18, 1906) in San Francisco. 



Forma typica. — Female from Sierra Laguna labeled and reported 

 as hinncral'ts; two females from La Chuparosa reported as gracilis, 

 and a female from the same place was also given as gracilis. 



Forma oblonga. — A male and female from San Francisquito, re- 

 ported as liionendis. 



Number of specimens studied, G. 



Type in my own collection (male), co-types in that of Mr. Fuchs. 



Type-locality. — Sierra Laguna, Lower California. 



Salient type-cliaracters. — Surface smooth and more or less aluta- 

 ceous. Body elongate and depressed. Prothorax widest at the mid- 

 dle, sides not strongly arcuate, less so posteriorly, marginal bead en- 

 tire; apical angles slightly prominent anteriorly and narrowly 

 rounded; basal angles obtuse and not rounded. Elytra with the 

 humeri obtusely angled ; surface finely, irregularly and obsoletely 

 punctulate. Anterior tibiae strongly and suddenly constricted at base. 



Diagnostic characters. — TihiaHs is a unique and very distinct 

 species in the United States fauna. I could not recognize it among 

 the Mexican species given in the Biologia. Although aberrant it will 

 have to constitute a group in the present subgenus until more material 

 can be studied; it is not far out of place, as the first joint of the 

 protarsi is clothed with yellow pubescence beneath and the genital 

 characters are more in harnumy here than elsewhere. It difi'ers from 

 all other species in its elongate, depressed, and subnyctobatoid forin; 

 the protibiae are constricted at base in the typical form, but not in 

 the oblong form. 



General oh ser vat ions. — The nientum is moderate in size, parabolo- 

 quadrate in form; inflexed lobes small, apex truncate or more or less 

 arcuate and more or less deflexed; surface moderately densely punc- 

 tate, punctures not crowded nor noticeably setigerous, laterally nu)re 

 or less feebly foveate and feebly convex centrally; base of the ligula 

 I'ather more exposed than usual. 



The prosternum is not strongly prominent ventrally, evenly convex 

 antero-posteriorly between the coxa^ and also behind, smooth and in 

 the specimens before me not in the least produced posteriorly. 



"Proceedings, Callfdiuia Aeadeiny of Sciences, 2d Ser., IV, Pt. 1, pp. 349-350. 



