191^] Alydincc of the United States 271 



From August 1st until late fall, the adults are found in 

 every section of Wisconsin, including the most northern counties. 

 They copulate in September and October, and the winter is 

 apparently passed in the egg stage. 



Three varieties of this species, differing considerably from 

 each other in color, may be distinguished as follows: 



a. Membrane pale with many fuscous dots; abdomen and margins of connex- 



ivum with flavescent maculae var. conspersus Mont 



aa. M( mbrane infuscate, not dotted. 



b. Connexivum and margin of venter, black with flavescent macula;. 



. var. infuscatus n. var. 



I'b. Connexivum and margin of venter broadly rufescent, latter to 

 beyond spiracles; rufescent band sometimes slightly broken by 

 the encroaching black coloration var. rufescens Barber 



14a. Alydus conspersus var. conspersus Montandon is the 

 typical form and the only one which has been recognized here- 

 tofore as belonging to the species. In addition to the spotted 

 membrane, it is characterized by fulvous pronotum (except 

 cephahc third) and castaneous corium. The distribution is 

 strictly boreal, including Canada\ Mame^\ Massachusetts^, 

 New York-'-a, New Jersey^-ii, Pennsylvania^ Ohio,^ Michigan\ 

 Illinois^, Indiana^, Wisconsin^-'^-^-'' , lowa'-^-^, DakotaS Col- 

 orado^- ^-'^^ and Arizona^\ The Arizona reference may concern 

 var. rufescens. 



14b. Alydus conspersus var. infuscatus n. var. is the melanic 

 form of the species, closely resembling and usually identified as 

 eurinus. The pronotum and corium are fuscous, sometimes even 

 piceous. and the membrane is dark, entirely without spots. 

 This variety and the typical conspersus have been captured 

 copulating on flowers. In the available material a large number 

 of males belong to the variety, but few females, and all the high 

 mountain and extreme northern specimens are of this type. 

 The distribution may possibly be Hmited to the northern 

 boundaries of the spread of the species. 



Holotype: d" , from Madison, Wisconsin. State collection. 



Allotype: topotypic. State collection. 



Paratypes: 2 cT's from Dutch Gorge and Palmer Lake, 

 Colorado, respectively. Ball collection. 



14c. Alydus conspersus var. rufescens Barber (Alydus 

 rufescens Barber (1911) 29, 30) has been considered a distinct 

 species heretofore but the genitaha prove it to be a southern 

 variety of A. conspersus. The head, pronotum, and corium 



