228 H. C. FALL. 



ner of Petalium. The same structure is obvious though much less 

 marked in debile. 



Very little is known as yet concerning the life habits of the 

 species of this genus. Certain species are known to inhabit galls, 

 while others have been found in the seeds or stems of various plants. 

 The following biological notes have for the most part been fur- 

 nished by the Department of Agriculture and include all that [ 

 have been able to learn in this connection. 



C. impressifrons. — One example from Department of Agriculture 

 is labeled "Willis, Texas, July 28, in seed of tobacco." 



C. grande. — "Shovel Mountain, Texas. In stems of Yucca." 



C. eonophilum. — " Las Vegas, New Mexico, December 5, in cone 

 of Pinus edulis" (Barber and Schwarz). 



G. tumidum. — One example, probably of this species though not 

 quite typical, was obtained from twigs of tig at Round Mountain, 

 Texas (Schaupp). 



C. uniforme. — " Mesilla Park, New 7 Mexico, March 14, in pith of 

 dead sunflower stem " (Cockerell). 



C. confusum. — Specimens in National Museum were bred " from 

 Cecidomyid galls on Celtis at Corpus Christi, Texas. Another ex- 

 ample is labeled " Baton Rouge, Louisiana ; bred from gall on 

 Hickory." Others were "bred from Dryophauta (?) galls on Quer- 

 cus sp. Rockport, Texas (Schwarz)." 



C. indistinctum. — Two examples without locality, " bred from 

 Cecidomyid galls on Pinus balsamse." 



C. sp. dub. — One example of a species near pingue, but perhaps 

 distinct, bred from Cecidomyid gall on Juniper, Los Angeles, Cali- 

 fornia (Coquillet). 



The tabulation of the species of this genus is a most difficult mat- 

 ter, and I foresee that the scheme which follows will, beyond a cer- 

 tain point, frequently he found inadequate or ambiguous by the 

 student, especially if he attempt without experience or a fair series 

 of correctly named species, to identify uniques. The task is indeed 

 quite hopeless, unless the specimens are clean and mounted in such 

 fashion as to clearly reveal the few essential characters upon which 

 their classification depends. The descriptions of the species follow- 

 ing the table will be found very short. It is believed that added 

 details would only obscure the essential differences, and thus impair 

 rather than increase their usefulness. 



