466 



PSYCHE. 



[June 1893. 



cus tuberculatus Beauw, hibernates as 

 a larva and reaches maturity about May 

 1st. 



Dr. Cyrus H. Thomas in 1S71 de- 

 scribed* a form of S. amerlcana under 

 the name of Acridium ambiguum and 

 stated that in southern Illinois it always 

 appears in small numbers in April or 

 May while amerlcana never appears 

 earlier than the middle of July. In 

 another placef ne sa y s °f ambiguum: 

 '•It is this variety which appears occa- 

 sionallv to pass the winter in the perfect 

 state." The specimens in my possession 

 may be his var. ambiguum but as far 

 as I can see they do not differ either in 

 structure or color from specimens of 

 the typical amcricana taken in this 

 vicinity in October. 



McNeill says of S. americana, that 

 its earliest recorded appearance at Rock 

 Island, Illinois/ is Sept. 20th \ ; while 

 Scudder records its capture at Fort 

 Reed andjacksonville, Florida, on April 

 ioth.§ This^comprises all the infor- 



mation at hand as to dates of appear- 

 ance at other places. 



That the species is, to a certain ex- 

 tent, migratory is well known, numer- 

 ous instances of this habit having been 

 recorded by Riley,* Thomas, and other 

 writers ; but these migrations all oc- 

 curred in late summer or in autumn. 



Its unexpected appearance here so 

 early in the season gives rise in my 

 mind to the following questions : Where, 

 if at any place, in the United States does 

 it hibernate as imago? Is it double or 

 treble brooded in such a locality? At 

 what point southwest of Terre Haute, 

 Indiana, does it occur mature as early as 

 April 1 2th in sufficient abundance that 

 it could be blown in numbers and scat- 

 tered over the streets of this city ? In 

 this locality it is evidently double 

 brooded, the first brood maturing in 

 June or July from eggs hatched in 

 spring, the other maturing in Septem- 

 ber or October. 



HOSTS OF NORTH AMERICAN TACHINIDAE, ETC., I. 



BY C. H. TYLER TOWNSEND, LAS CRUCES, N. MEX. 



The following twenty-seven species 

 of tachinids, sarcophagids, etc., were 

 all bred by Prof. S. A. Forbes, in Illi- 

 nois. They were included in a large 

 collection of Muscidae sent to me for 

 determination from the Illinois State 



* U. S. geol. surv. of Montana, 1S71, 447. 



t Psyche, VI, 73. 



% Ninth Rep. st. ent 111., 1SS0, 133. 



§ Proc. Bost. soc. nat. hist., XIX, S6. 



Laboratory of Natural History at 

 Champaign. 



1. Cistogaster immaculata Mcq. — 

 One bred from Leucania unipujtcta. 



2. Ocyptera euckenor Wlk. — One 

 bred from "Acrididae." Also one 

 (smaller specimen) from Leucania 

 unipuncta. 



* First Rep. U. S. ent. coram., 449. 



