122 THE CANADIAN ENTOMOLOGIST. 



Sacken has informed me that they have there a Cecid. Loli, infesting the 

 heads of Lotus and Medicago, but that the larva as described by Winnertz 

 seems different from ours, judging from the description given by me. Dr. 

 Hagen compares our species with the European Cecid. sysymbrii, in its 

 form and venation. 



I have recently been successful in obtaining examples of the imago of 

 Cecid. leguminicola, unknown to me at the time of my description of the 

 larva. Anticipating failure (since realized) in my efforts to rear it from 

 the larva; obtained by me last year, I applied, in May last, to Mr. R. J. 

 Swan, of Geneva, N. Y., who at the Annual Meeting of the N. Y. State 

 Agricultural Society, in January, had spoken of the occurrence in very 

 large numbers of the larva; in a clover field upon his farm, requesting that 

 some of the surface soil from the field might be collected and forwarded 

 to me. A small box of the earth (containing also some of the clover 

 roots) of about six inches cube, was received by me on the 2nd of June, 

 and spread out in a glass-covered case. On the following morning a male 

 and female, in copula, were found in the box. Additional examples were 

 disclosed from the earth — about twenty-five in all — from that time to the 

 27th of June, since when none have been obtained. They had undoubt- 

 edly commenced to emerge during the month of May. 



The insect is a true Cecidomyia, and belongs to Section I, subsection 

 A of Winnertz' arrangement as defined in Osten Sacken's paper on the 

 N. A. Cecidomyia; in Loew's Monograph of the Diptera of North America, 

 Part I., viz. : I. Wings with three longitudinal veins, the third either 

 forming a fork or becoming more or less obsolete toward the tip. A. 

 Cross-vein placed between the root and the tip of the first longitudinal 

 vein (in this section the cross-vein is frequently almost obsolete). 



The neuration is shown in fig. 1, p. 174 of Loew's Monograph. 



Marked features of the species, which will serve in its recognition, are 

 the genitalia of the male, which are quite broad, projected on a pedicel, 

 and arranged in an extended pair of clasping organs ; and the long jointed 

 ovipositor of the female, of about twice the length of _the abdomen. 



The antenna; of the Cecidomyia; afford perhaps the best features for 

 determination of species. The following description of the antenna; of 

 the male of C. leguminicola was drawn from fresh specimens just after death : 



Number of joints seventeen in all — the basal one colored and short, 

 the next one black, short and naked, followed by fifteen verticillate ones. 



