THE CANADIAN ENTOMOLOGIST 243 



SYNOPSIS OF HALICTIN.F. 



BY CHARLES ROBERTSON, CARLINVILLE, ILLINOIS. 



In connection with the study of the pollination of flowers by insects, 

 for several years and in several journals I have published notes on the 

 local Halictinse, with descriptions of new species and the missing sexes of 

 some which were only known in one sex. This paper is intended to 

 bring my results together in a brief form. 



The so-called genus Halictus of authors seems to be altogether too 

 heterogenous. 1 restore Lasiogiossum and propose two other new 

 genera. I think that the several genera must stand or fall together. 

 The venation shows that Agapostemon and Augochlora are more closely 

 related to Halictus, as here limited, than are Lasiogiossum, Evylaeus and 

 Cliloralidus. 



As regards the dull greenish or bluish species, the venation shows 

 that H. fasciatus belongs to Halictus, as here limited, a conclusion which 

 is supported by the form of the pubescent fasciaa. The rest fall into 

 Chloralictus, Paralictus and Dialictits. 



Hemalictus, Ckll., holds the same relation to Evylaeus that Dialictus 

 holds to Chloralictus. It is significant that these two genera are 

 developed from forms in which the vein III. is normally enfeebled. 



Remarkably different from Andreninaa, this nervine is very constant 

 in Halictinse. I have found it wanting in one specimen of Chloralictus 

 versatus and in one of Evylaeus cylifidricus received from Pe'rez, of 

 Bordeaux. I have one specimen of Oxystoglossa cou/usa with the vein 

 rni wanting in one wing, and another with veins rm and III, both 

 wanting in one wing. 



Oxystoglossa, Sm., has a definite type which, I judge from the 

 description, belongs to the group having the hind spur finely serrate. 

 The name is therefore used to designate that group. 



In this paper vein rm = the radio-medial cross-vein = ist cubital 

 nervure ; vein III 5 = 2nd cubital nervure j vein IV 3 =ist recurrent 

 nervure ; vein a = the cross-vein element of the arculus = the basal 

 nervurej cell III I+2 = the marginal cell; cell III 5 =2nd submarginal cell; 

 cell III 4 = 3rd submarginal cell; '"segment" refers to the abdomen; 

 "joint" refers to the antenna. 



Females. 

 Front wing with veins beyond IV, obsolescent ; cells III 4 and 

 II I 5 subequal 5. 



