some Parasitic Bees. 



37 



joints of antenn.Ee and base of fourth red ; considerable white 

 hair about base of antennas (not so in T. bardus), but clypeus 

 and adjacent sides of face hairless ; clypeus and face extremely 

 closely but very distinctly punctured ; pleura very strongly 

 punctured ; tubercles red ; hind border of prothorax densely 

 pubescent ; mesothorax extremely densely punctured, not 

 hairy, but having a sort of mealy appearance ; two short 

 anterior stripes of pubescence (slender and very weak in 

 mesillce) ; scutellum not or hardly at all bilobed, its lateral 

 teeth very long and pointed ; only the margins of pleura 

 hairy ; tegula? apricot-colour ; legs red, some blackish suffused 

 markings on middle and hind femora ; hind tibial spurs dark ; 

 hair on inner side of basal joint of hind tarsi orange ; abdo- 

 men extremely closely punctured ; fifth segment without a 

 band, convex, with fine silvery pubescence, and with a 

 quadrate minutely roughened red area ; apical plate red, 

 punctured, sharply truncate ; ventral surface of abdomen not 

 banded, but pruinose, with minute white pubescence. They 

 differ as follows : — 



T. pimarum. 



Larger, length about 12| millim. 

 Clypeus red. 



Mesothorax red, with a broad 

 median black band. 



Scutellum and pleura (except an 

 oblique black band) red. 



Teeth of scutellum curved at 

 ends. 



Apical plate of abdomen not or 

 hardly keeled. 



Punctures at sides of second and 

 third ventral segments of abdomen 

 not conspicuously different. 



Wings quite dark, nervures 

 piceous. 



Three submarginal cells. 



T. mesillce. 



Smaller, length 11 millim. 

 Clypeus black, with anterior 

 margin red. 



Mesothorax entirely black. 



Scutellum black, the ends of the 

 teeth red; pleura black, with a 

 faint reddish spot. 



Teeth of scutellum straight. 



Apical plate of abdomen keeled. 



Punctures at sides of second and 

 third ventral segments very diffe- 

 rent, those of second being much 

 larger and less dense. 



Wings not so dark, nervures 

 fuscous. 



Nervure between second and 

 third submargiual cells usually in- 

 complete. 



T. pimarum was found by myself at Alhambra, Salt River 

 Valley, Arizona, in the autumn of 1899, at flowers of Verbe- 

 sina encelioides. Of T. mesillai I collected a number of 

 specimens at Mesilla, New Mexico, Sept. 24. For a long- 

 time I have had the latter species labelled with doubt 

 T. bardus, Cresson, but I believe it to be distinct, though 

 closely allied. According to Mr. Brues the scutellar teeth of 

 bardus are incurved. 



