34 PROCEEDINGS OF THE NATIONAL MUSEUM vou 71 



Male. — Length 0.50 mm. Agrees with the female except that the 

 antennae are 12-jointe(i, twice as long as the insect, the pedicel about 

 one and one-half times as long as thick, the funicle joints subequal 

 in length, the first about four times as long as thick at apex; abdo- 

 men shorter than the thorax, its venter not produced anteriorly. 



Type locality. — Kirkwood, Missouri. 



Cotypes. —Csit. No. 29454, U.S.N.M. 



Described from one hundred and twenty-three specimens compri- 

 sing several series and representing several generations reared through 

 different hosts, received from A. F. Satterthwaite, of the United 

 States Bureau of Entomology, field laboratory located at Webster 

 Groves, Missouri. This material is as follows: Five females reared 

 from eggs of Calendra? minima collected in the field at Kirkwood, 

 Missouri, July 3, 1924, and record erd under Webster Groves No. 

 24106; four females and one male (progeny of those under No. 24106) 

 reared from eggs of C. destructor in laboratoiy under Webster Groves 

 No. 24117; seven females (progeny of those under No. 24117) reared 

 in laboratory from eggs of C. callosa under Webster Groves No. 

 24153; nine females and one male (likewise progeny of No. 24117) 

 reared from eggs of C. costipennis in laboratory under Webster Groves 

 No. 24168. A second series consists of five females reared from the 

 egg of C. parvula collected in the field on timothy at Kirkwood, Missouri 

 (Webster Groves No. 24086) ; seven specimens, progeny of the fore- 

 going, produced through eggs of C. parvula in the laboratory (Web- 

 ster Groves No. 24110) ; and five specimens, progeny of No. 241 10, pro- 

 duced through eggs of C. pertinax (Webster Groves No. 24134). 

 The species was also successfully bred through eggs of C. maidis, 

 seven specimens being obtained (Webster Groves No. 24157). The 

 remaining 72 specimens of the type series were obtained in the same 

 manner as those already listed and involve the same host species, but 

 some were obtained from different localities. In order that these 

 localities may be recorded and this type material identified it may be 

 listed as follows: Webster Groves No. 22135a, Grenada, Mississippi ; No. 

 2212571, Greenville, Mississippi; No. 22150;?, Boschertown, Missouri; 

 No. 221746 and 22174c, Webster Groves, Missouri; No. 24109, No. 

 24118, No. 24135, No. 24138, No. 24156, No. 24169, No. 24159, No. 

 24130, and No. 24125, Kirkwood, Missouri. 



One hundred and eleven specimens of the type series, including the 

 holotype and allotype, are mounted in balsam on 41 slides; 12 para- 

 types are mounted on card points. 



There is a wide variation in size of individuals in this series, the 

 length of females ranging from 0.40 mm. to 0.90 mm. with a corre- 

 sponding variation in other dimensions. The size of individuals is 

 directly correlated with the size of the host egg and the number of 

 individual parasites harbored by it. The largest individuals were 



