270 H. C. FALL. 



ately complex and exhibit differences of detail which are, perhaps, 

 quite as significant, as Dr. Smith has shown them to be in Lachno- 

 stertia, I have, however, not attempted to investigate the matter 

 thoroughly, as the use of these characters in such small insects 

 would be quite impracticable. The species of this genus or at least 

 some of them are known to pass the larval state in puff balls (Lyco- 

 ■perdon) The perfect insects are found for the most part on oak 

 foliage. The following table will not be difficult to use with prop- 

 erly mounted specimens, i. e., with specimens in which the antennae 

 have been drawn out and the head raised so that the palpi may be 

 seen, the accomplishment of which requires some little patience and 

 delicacy of manipulation on the part of the student. The descrip- 

 tions will be found for the most part very brief and consist largely 

 of comparisons with the common oculata, with which most students 

 are or ma} 7 easily become familiar. 



Punctures of upper surface sparse, those of the head and pronotum especially 

 fine and remote; those of the elytra arranged in somewhat regular 

 series 1. frontalis. 



Punctures of upper surface moderately numerous, those of the elytra not 

 arranged in series 2. 



2. Pubescence relatively short and much inclined ; antenna] club in male black- 



ish, in female pale 2. sycmuoides. 



Pubescence longer and erect ; antennae pale in both sexes ... 3. 



3. Eyes of male but little larger than in the female, deeply acutely incised, or 



nearly divided in both sexes 4. 



Eyes of male larger than in the female, the front ( % ) narrower than the 

 longest diameter of the eye 7. 



4. Form less broadly rotuudate ; sexual disparity in the eyes more evident ; front 



in % a little wider than the longest diameter of the eye. 



3. siinilis. 



Form very broadly rotuudate, sexual disparity in the eyes feeble; front in % 



about one-half wider than the longest diameter of the eye 5. 



5. Last joint of antennae ( % ) fully four times as long as wide and distinctly 



arcuate 6. 



Last joint of antenme ( %,) about three times as long as wide, not arcuate, but 

 similar in the sexes ... 4. lateralis. 



6. Last joint of palpi broadly triangulares wide as long, the apex squarely trun- 



cate; size large, punctuation rather sparse and coarse- • .5. oculata. 

 Last joint of palpi less broadly triangular, distinctly longer than wide, the 

 apex obliquely truncate; size smaller, punctuation finer and closer. 



Color black, pubescence luteous 6. blaiichardi. 



Color brown or piceous brown, pubescence fulvous 7. califbrnira. 



Last joint of palpi narrow, that of maxillary palpus subparallel and more than 

 twice as long as wide 8. iieomexicana. 



