SOUTHERN CALIFORNIA ACADEMY OF SCIENCES 159 



The Bees of Southern California. VI.* 



BY T. D. A, COCKERELIv. 



TRACHUSA, Jurine. 

 Trachusa perdita, n. sp. 



Male ; length about 12 mm. ; black ; head and thorax rugose, 

 the punctures excessively close, the dorsum of the thorax en- 

 tirely dull, its pubescence and that of occiput light 

 greyish with a faint yellowish tint; that of face, 

 cheeks, pleura and sides of meta-thorax white; 

 clypeus and lateral face-marks cream-color; the lateral 

 marks triangular, filling the interval between the cly- 

 peus and the eyes, and ending a little above the level of the 

 upper margin, of the clypeus, the angle formed by the upper 

 margin of the lateral face-marks and the eye a right angle; 

 clypeus shining, the punctures strong, but well separated, a 

 strong median longitudinal ridge ; middle anterior margin of 

 clypeus with six little brown nodules; mandibles black; facial 

 quadrangle much longer than broad; antennae entirely black, 

 third joint longer than fourth; thorax black without markings; 

 tegulae very dark brown, strongly punctured; wings stained 

 with reddish brown, especially in the marginal cell; second 

 recurrent nervure passing beyond tip of second submarginal 

 cell ; basal nervure meeting transverso-medial ; legs entirely 

 black, except that the tibial spurs are reddish-orange, and 

 the claws are ferruginous at base ; pulvilli large ; abdomen 

 black without light markings, the hind margins of the seg- 

 ments with thin bands of white hair; punctures stronger and 

 closer on the second and fifth segments than on the third and 

 fourth; sixth segment with a subapical nodulose transverse 

 keel from which proceeds a little keel in the middle line to 

 the hind margin, which is ferruginous and curved outwards ; 

 seventh segment black, broadly and deeply emarginate ; geni- 

 talia dark- ferruginous. 



Tehachapi, California ; one collected by ^x. Davidson. The 

 ,genus Trachusa has hitherto been known from Europe, and 

 its discovery in America is of great interest. The present 

 species departs from typical Trachusa, and leans towards 

 Dianthidium, in the venation; evidently the two genera are 

 closely allied. In general, it is remarkable how greatly our 

 insect resembles T. serratulae, which I have from Innsbruck 

 (Fiese). 



*CorLtinued from p. 90 (this volume) No. 6, June, 1904. 

 Erratum. In part V, p. 88, the characters given under 4 in the table 

 refer to A. cardui, ekll, A couple of lines were omitted in printing. 



