some Parasitic Bees. 



37 



joints of antenna and base of fourth red ; considerable white 

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

 and adjacent sides of face liairless ; clypeus and face extremely 

 closely but very distinctly punctured ; pleura very strongly 

 punctured ; tubercles red ; liind 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 ; tegulse 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 follovvs : — 



T. pimarum. 



Larger, lengtli about \2\ millim. 

 Cljpeus 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. jnesillce. 



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. 



Neivure between second and 

 third submarginal 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- 

 siiia encelioides. Of T. mesillce 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, thouo-h 

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

 bardus are incurved. 



