70 INSECUTOR INSCITI^ MENSTRUUS 



mens and find the setae of the outer lobe of side-piece stouter 

 than in the American form. The coloration is very similar. 

 I am of opinion that the American form is a race of the 

 European, and should be classified as A. communis lazarensis. 

 I' have already referred tahoensis as a race, which may now 

 stand A. communis tahoensis. In regard to pionips, a. distinct 

 species is clearly involved, as the larval differences are striking. 

 The species is larger, and though the markings are very similar, 

 the habits differ, pionips appearing late in the season from 

 river and lake-pools, whereas lazarensis and especially tahoensis, 

 hatches very early and can be found when the ground is still 

 snow-covered. 



Another representative of this group appears to be detritus 

 Hal. ; but this is a salt-water breeder and is entirely unrepre- 

 sented in America. 



Further there are two species representing cataphylla and 

 impiger, the former called cataphylla, var. rostochiensis Mart. 

 I have some examples of this by the kindness of Dr. Martini, 

 and do not trace any resemblance in the thoracic markings to 

 those of cataphylla, with which I am familiar by the personal 

 collection of hundreds of examples. I therefore think that the 

 species should be A. rostochiensis Mart., representing our 

 cataphylla in Europe, but specifically distinct. In regard to 

 impiger, salinellus Edw. is its European representative, as Mr. 

 Edwards himself states. 



Our desert form, niphadopsis D. & K., may be represented in 

 Europe by A. albescens Edw. from West Siberia, known only 

 in the female. 



Group curriei 



There are a number of species of this group in Europe, tv/o 

 of which (pulchritarsis Rond. and the recently described 

 berlandi Seguy) contradict the genitalic character I gave for 

 the group by having a spine on the basal lobe of side-piece. 

 Of the group, one seems certainly common to both continents. 

 The following synonymy will therefore replace one of our 

 familiar names : 



