492 ^Ir. T. D. A. Cockerell on new Species q/'Perdlta. 



The two species, P. syriacus and P. Bottce.^ have already 

 been sufficiently well defined by Pictet and Humbert [pp. cit.), 

 and an imperfectly defined larger species, P. grandis, is 

 described by J. \V. Davis (Trans. Eoy. Dublin Soc. [2] 

 vol.iii. (1887), p. 510, pi. xxviii. fig. 4). An examination of 

 the original specimen of P. longispma, Davis [loc.cit. p. 511, 

 pi. XXV. fig. 2), convinces me that it does not belong to this 

 genus, but is referable to an entirely distinct fish commonly 

 known as Clupea Bottce, Pict. & Humb. Pseudoberi/x has 

 hitherto been found only in the Upper Cretaceous of Hakel, 

 Mount Lebanon. 



LXVIII. — Four new Bees of the Genus Perdita collected by 

 Dr. L. 0. Howard in Mexico. By T. D. A. CoCKERELL, 

 New Mexico Agricultural College. 



Perdita Howardiy sp. n. 



$ . — Length about 6 niillim. 



Bright lemon-yellow ; tips of mandibles darkened; frontal 

 fovea a black stripe ; a narrow black line extending from 

 each lateral ocellus to the adjacent eye ; abdomen with four 

 narrow entire black bands at the sutures between the seg- 

 ments ; second abdominal segment with a longitudinal black 

 stri])e on each extreme side ; pleura without any black patch ; 

 tarsi more or less fuscous ; stigma faintly tinged with yel- 

 lowish ; nervures colourless ; marginal cell obliquely trun- 

 cate, its substigmatal and poststigmatal parts about equal 

 in length ; second submarginal cell narrowed rather more 

 than half to marginal ; third discoidal distinct. Head 

 ordinary; lower part of face pellucid white; mesothorax 

 naked, a very narrow black line along its anterior margin ; 

 tegulte colourless, transparent. 



(J . — Frontal fovea a black dot ; no line from the ocelli to 

 the eyes ; abdominal bands more obscure ; otherwise like the 

 female. Claws cleft. 



Halt. y. Josd de Guaymas, Mexico, April 10, 1898 {L. 0. 

 Howard) . 



It is a pleasure to name this beautiful species after its well- 

 known and esteemed discoverer. P. Howardi^ by its yellow 

 colour and the absence of a black patch on the pleura, comes 

 near to luteola, from which it is easily distinguished by 

 the abdominal bands. It is also a vernal species, whereas 

 luieola is autumnal. Seven specimens were obtained. 



Perdita Ashmeadij sp. n, 

 ? . — Length about 4^ millim. 



Head and thorax shining dark olive-green ; abdomen 

 flattened, very dark brown above, without marks, dull 



