282 THE CANADIAN ENTOMOLOGIST 



obconical, longer than the second joint, the third joint a little longer than 

 the second; the following joints lo the last are nearly equal, slightly 

 longer than thick, the last as long as the first ; the mesonotum and the 

 scutellum are smooth and shining, but with minute, scattered punctures ; 

 the area at base of the metanotum is rugulose but not bounded by a 

 salient rim, the posterior face smooth, impunctured, the mesopleura closely 

 punctured. The abdomen is oblong oval, smooth and shining, but the 

 derma, under a strong lens, shows some delicate, microscopic, transverse 

 aciculations. The dorsal segments 2 to 5 have a band of white, appressed 

 pubescence at base. The legs are black, with the tarsi ferruginous, the 

 tibipe, middle femora beneath and the tarsi with a ferruginous pubescence. 

 Wings hyaline, the subcostal and median veins black, the stigma and 

 other veins pale yellowish. 



Type.— No. 8104, U. S. N. M. 



Manila (Father Stanton). 



Family XIX. — Larrid^. 



Th YREospii EX, new genus. 



The wasp forming the type of this genus is a true Larrid, but differs 



greatly in certain characters from all others so far discovered. It falls 



into the subfamily Larrince, and between the genera Tachytes, Panzer, 



and Tachysphex, Kohl. 



My generic table of the genera, published in the Canadian 

 Entomologist, Vol. XXXI. , 1899, p. 244, may be modified to contain 

 this new genus, as follows : 



12. Second cubital cell receiving both recurrent nervures, the first 

 transverse cubitus not angularly broken ; face 



normal Tachytes, Panzer. 



Second and third cubital cells each receiving a recurrent nervure, the 



first transverse cubitus angularly broken at its basal third ; face 



abnormal, with a shield-like plate anteriorly that extends over the 



base of the antenna?. ^ ( 9 unknou"n).Thyreosphex, Ashm., gen. nov. 



Thyreosphex Sta?ito?ii, new species. — (J. Length, 5 mm. Black 



and shining, with some sparse, microscopic punctures, the face, from the 



front ocellus, .anteriorly more or less rugulose, with irregular, elevated 



lines, and a distinct median carina; eyes parallel, large, extending to the 



base of the mandibles ; the shield-like plate that covers the base of the 



antennse is rounded anteriorly and broadly margined with white ; the 



clypeus is sparsely clothed with silvery hairs; the mandibles have a rufous 



