I.S THE (ANAUI.VX KNT(iMOUMU(<T. 



of the worlds best in art, in music and in literature, his kindly liuman 

 sympathy and his earnest interest in the deeper problems of existence. 

 This effort to express our appreciation will not seem fulsome to those to 

 whom his worth has been revealed in close |)ersonal friendship and co- 

 operative work. In expressing our own keen sense of a great loss, we 

 desire also to extend our sympathy to those of his own household and 

 the relatives who must still more deeply feel their heavy bereavement." 



NOTES ON THE HABITS OF D/SOGMUS PUBESCENS, 



KKIFFER. 



BY G. E. S.XNDERS, LRB.\NA, ILI . 



On June 3, 1909, at Aurora, III., in following the plow in a timothy 

 field heavily infested with the larv?e of a Carabid, Amara carinata, two 

 were found to contain parasites, and on June 7th two adult 9 Disogmui 

 pubescens were obtained from them. 



When taken, the Disogmus were both freshly-formed chrysalids, wholly 

 bare, and attached by the posterior end to the larvae from which they had 

 emerged. In both cases the Disogmus larva had developed singly within 

 the host larva, with its head end toward the hinder part of the Amara larva. 

 The Disogmus larva emerges from its host, breaking through the ventral 

 segments near the posterior end, until only the tip of the abdomen remains 

 attached. The«chrysalid is formed with its ventral surface toward the 

 Ventral surface of the host larva, the two being joined at the posterior ends 

 to form a V. When taken at 9 a.m., June 3rd, the two Chrysalids were 

 perfectly white, excepting the eyes,- which were brown. At 5 p.m., June 

 3rd, the ocelli had turned brown, and the thorax in both was beginning to 

 show a slight brownish tinge. On June 5th the head and thorax in both 

 were black, the abdomen still white. On June 6th the abdomen was 

 reddened slightly. On June 7th both adults emerged. 



Regarding the development of the host, .Amara : the chrysalids were 

 formed from May loth to .May 14th, and the first adult emerged May ^Sth. 

 .\n examination of the field on June 14th showed many adults present; 

 only one chrysalid was found on this date. 



On October 151I1, 1 90S, one 9 Dho^^mus pubescens \sdA\Vi\i^x\ burrow- 

 ing three inches down in a corntield at Urbana, Illinois. This indicates 

 that the species is probably two brooded. 



As it is improbable that more information on the life-history of 

 Disogmus will be obtained soon, and hitherto none of the hosts of this 

 genus have been recorded, these notes are given as a matter of record. 



February, 19K1 



