434 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



hu'is ill general habitus, but more elongate and more opaque, and 

 these specimens are from Cape St. Lucas and El Taste, LoAver Cali- 

 fornia. I do not believe true innocens occurs in Arizona. Doctor 

 Horn referred the peninsular form of insularis to gentilis and qnadn- 

 collis. This form of Insularis occurs in the same region with inno- 

 cens; both were collected at El Taste by Gustav Beyer. If my con- 

 clusions should prove incorrect I should be very much surprised. 



Subgenus DISCOGENIA LeConte. 



Mentum transverse, trilobed, inflexed lateral lobes rudimentary, 

 invisible without dissection. Thorax transverse. Elytra Avith the 

 humeri rounded, rarely obtuse. 



Pro femora armed or sinuate in the male; feebly armed or mutic 

 in the female. 



The internal spurs of the meso- and metatibise are slightly longer 

 than the external. 



iSnhgeneHc genital characters^ male. — The characters, although not 

 distinctive of the present subgenus, may be stated as follows: Apicalc 

 of the edeagophore triangular, depressed, with a more or less widened 

 median membranous groove. 



Female. — Genital segment triangular in outline, glabrous, not 

 setose, and fully chitinized ; valvular apices strongly produced, diver- 

 gent and excurved. 



Sirperior pt(dendal membrane reaching at least to the middle of 

 the dorsal plate. Internal ventral margins of the valves contiguous. 

 Genital fissure closed and subapical. Appendages minutely puncti- 

 form. 



The subgenus as at present defined contains three species that are 

 not strictly homomorphic, and may therefore be divided into two 

 groui)s as follows: 



Thorax widest at the uiidrtle, sides evenly arcuate from base to apex; tirst 

 joint of the protarsi distiuctlj' thickened at apex beneath, more stronjily so 

 in the female Group A. 



Thorax widest just in advance of the middle, sides slightly convergent behind 

 and briefly sinuate just in front of the basal angles; protarsi with the first 

 one or two joints slightly thickened at ai)ex beneath, more strongly so in 

 the male Group B. 



Group A contains marginata and scahricula; group B the somewhat 

 remarkable planipennis. 



The taxonomical arrangement of the subgenera constituting the 

 genus Eleodes is that in the order of morphological sequence, pri- 

 marily based upon the structural modification of the valves of the 

 genital segment in the female. 



The subgenera most closely related to Discogenia are Metahlapylis 

 and Steneleodes. The approach to the closely related genus 



