1922] Synopsis of Panurgidce 159 



SYNOPSIS OF PANURGIDJ*: (HYMENOPTERA). 

 By Charles Robertson. 

 Carlinville, Illinois. 



My synopses of local bees are intended to show how I 

 distinguish them. It is assumed that the student has only the 

 local species and all of them. Nothing follows from such a 

 statement as that ChloraUcfus nymphalis runs to C. testaceus 

 in my table of Halictinge. If it had been one of the local species, 

 it would not have run to that name. 



The differences between the Panurgidse and Dufoureidse 

 are partly mentioned in the "Synopsis of Anthophila", Can. 

 Ent. 36: 42, 1904. The local species mix the pollen with honey, 

 but Panurgus evidently does not. It has a large scopa which 

 is not necessary in those which stick the pollen with honey. 



Often the two cubital cells are not homologous, so that the 

 bees are referred here on account of other resemblances. In 

 Perditinse the cubital cells are the first and third, the second 

 being obliterated by coalescence of the first and second transverse 

 cubital nervures. The "first transverse cubital" is a compound 

 vein, and the "second" is really the third. Usually in the rest 

 of the Panurgidce the true second transverse cubital vein is 

 wanting and the one called "second" is the third. The "second 

 cubital cell" is composed of the second and the third united. 

 I have a specimen of Pseudopanurgus compositarum with three 

 cubital cells. In true Panurginus I think the first and second 

 cubital cells are united and that the venation is not homologous 

 with that of American species which have been referred to that 

 genus. I have seen P. albopilosus and montanus, determined by 

 Friese. These have an independent origin from forms having 

 three cubital cells. 



Abbreviations. — Ip 1 = basal joint of labial palp; Ip 4:2 = 

 length of first and second joints as 4 to 2; Ma, Mas = long-tongued 

 bee flowers; Mi, Mis =short-tongued bee flowers; mp 6 = 

 maxillary palps six-jointed; oligolege = bee collecting pollen 



