136 



exists in the structure of the seventh and eighth sternites l)ut 

 these differences do not seem significant enough to form generic 

 divisions upon. There are, however, differences in the form 

 of the supraclypeal area, of the collar and of the propodeum 

 which may on further studv be found to supplement the genital 

 characters. Thus the Boreal American HyJaeus basalis 

 (Smith) niaj well be isolated since there are differences there 

 in bodily structure in addition to the genital characters. On 

 the other hand Hylaeus p'lctus (Smith) of which I have seen 

 specimens from Malaga, while differing greatly in coloration 

 and appearance from other European and the J^orth American 

 species, does not appear to have either genital or soiiiatic char- 

 acters warranting its removal from the genus Hylaeus. Wliile 

 time and the material at my disposal has limited my exami- 

 nation to about thirty Australian species I have not seen any 

 species which seems assuredly referable to Ilylacu-!. tho 

 some seem close to that genus. An interesting color group 

 there is that of the black species with the scutelluni and meta- 

 notum yellow, which by the examination of the genitalia and 

 somatic structures would fall into about four distinct genera, 

 wdth ample characters for their separation. From Africa I 

 have seen several si)ecies in the group of Jlylncus curricarijirdus 

 (Cameron) which are clearly Hylaeus but they have excellent 

 group characters which I have considered warrant the erection 

 for them of the subgenus Deranchylaeus. Some Japanese 

 species are here descril)e(l which some of them seem typical, 

 while two of these species are more divergent. T have unfor- 

 tunately not seen any of the neotropical species. 



19. Deraxcmivt.aets u. subgeu. of Hvlakus. 



In my travels in Africa in 1914 and 191.') l)esides the 

 species here separated in the genera Metylaeiis and Nothylaeus 

 I found nine species of Hylaeus falling into a compact group 

 differing from all other species of Hylaeus which I have seen 

 by the supracly])eal area being bounded laterally l)y two fine 

 outwardlv curved carinae and not at all declivous above. The 



