May. '02] ENTOMOLOGICAL NEWS. 139 



FEMALES. 

 Facial prominence entire ; pubescence of sixth dorsal abdominal segment 



black gibbosus. 



Facial prominence not entire, consisting of two widely divergent teeth 

 or prongs. 

 Pubescence of sixth dorsal segment fulvous brown, varying to purplish 



black ; ventral scopa yellowish apicalis. 



Pubescence of sixth dorsal segment black ; ventral scopa whit- 

 ish echinocacti. 



MALES. 



P'ace and clypeus closely punctured ; sixth abdominal segment with black 



pubescence (except the apical white margin) . . . . gibbosns. 



Face and clypeus sparsely punctured ; sixth abdominal segment with 



yellowish white pubescence apicalis. 



From the material at hand I am not able to satisfy myself 

 that the several forms or varieties mentioned are really such or 

 distinct species. A large series from various localities is needed 

 to settle this matter. 



1. Lithurgopsis apicalis (Cresson). 



Lilhurgus apicalis Cresson, Rep't Expl. and Surveys W. of looth 



Merid. (Wheeler), Vol. V, p. 724, 1875. $. 

 Lithurgus apicalis Cockerell, Amer. Naturalist, Vol. XXXIV, p. 



488, 1900. 9 c?- 

 Lithurgus gibbosus Cockerell (non Smith), ibid, p. 487, $ (cJ?). 



Colorado ; New Mexico ; Arizona. The Arizona examples 

 have the pubescence of sixth dor.sal segment blackish, but a 

 tendency to blackness is also shown in some Colorado examples. 



Mr. Cocker^W s gibbosus \^ noX. the same as Smith's, and is 

 what I consider a form of apicalis. This form with dark 

 pubescence on sixth dorsal abdominal segment varies within 

 itself; otherwise 1 would be inclined to regard it as distinct. 

 Whether the male of this form, called compressus Smith, by 

 Cockerell, is really compressus or not I cannot say, not having 

 seen specimens. 



A series of three males, from Colorado, are more hirsute, the 

 pubescence pertaining more to yellowish than to grayish, as in 

 the typical form, and the fulvous-brown pubescence of sixth 

 segment is replaced by light yellow or grayish yellow. 



2. Lithurgopsis echinocacti (Cockerell). 



Lithurgus echi7wcacli Qoc\iGrG\\, Ann. Mag. Nat. Hist., p. 453, 

 December, 1898, ?. 



