34 



CALIFORNIA ACADEMY OF SCIENCES. 



Third joiut of the maxillary palpi 

 gradually aud rather strongly dilated 

 toward the apex which is truucate; 

 fourth small, slender aud subulate. 



Labial palpi short with the two ba- 

 sal joints sub-cylindrical, the second 

 a little longer than the first; the 

 third small, slender, acuminate. 



Paraglossa) acuminate. 



Third joint long and slender, rather 

 feebly dilated, cbconical; fourth 

 short, slightl}' oblique, conical, acute- 

 ly pointed, nearly as wide at base as 

 the apex of the third and received 

 partlj"^ within it. 



Labial palpi slender, first joint 

 longer than wide, about oue-half as 

 loug as the second, which is slender 

 and min-e or less dila'ed at the apex; 

 third conical, very slender, acute, 

 much narrower at base than the apex 

 of the second. 



Paraglossie elliptically rounded at 

 tip. 



Auteunio with the second joiut 

 distinctly shorter than the third. 



Antennre having the second and 

 third joints sub-equal. 



There are also difi'erencos in the structure of the abdomen, aud in the rela 

 tive sizes of the segmeats. 



Except in the characters given above, the two genera are 

 somewhat simiUir. In applying these to the entire gronp of 

 North American species, it is easily seen that the antennal 

 strnctnro is not entirely constant, there being a few species 

 in which the second and third joints are nearly equal in 

 length. The components of a very limited group of small 

 species containing 'pnsRhun, lepidmn, etc., have the fourth 

 joint of the maxillary palpi small, acicular aud not conicah, 

 and those should probably be referred to a closely-allied 

 genus or to a sub-genus; all the others have the fourth joiut 

 conical and pointed, although varying greatly in tliickness 

 at the base", all being, however, variations of one commo]! 

 t^'pe, which is the conical and acairlij pointed Dr. Sharp 



' LeConte— Proc. Amer. Phil. Soc. XVII, 1S7S, p. 392. 



- Tlie two species, conveniens aud purallel/im, described by me ^Cont. II, 

 ]ip. li'j-l.'{l), and very erroneously united by Dr. Iloru ^Eut. Anier, I, j). !(>!>) 

 under the head fif an entirely distinct sp(H;ifS—//(;/vV^rt/tMW— serve as a good 

 ilhistration of this varial)ility of the fourth jnint, this being conical and very 

 narrow, small and almost ueiculnr in co)iveri/enK, and .scarcely longer than 

 wide, l)iing strongly ccniical, liatti'Ued and almost as broad at base as the 

 ai)ex of the third in paruWIum. Having here incidentally made a correction 



