THE CANADIAN ENTOMOLOGIST. 239 



female oi pubescens the last ventral has a much smaller emargination of 



nearly same shape as in the male, while in deleta ( ? ) the emargination is 



bisinuate. Pubescens is evidently broader and a little less convex than 



deleta^ and — so far as my experience goes — may always be distinguished 



from the allied deleta^ deserta and lixa by the anterior discal impression 



of the pronotum, which though slight is very constant, but is entirely 



lacking in the others. Deleta has a transverse series of four small 



callosities on the pronotum, the outer two often ill-defined. \n pubescens 

 these callosities are lacking, while in deserta they are larger and all four 

 distinct. Deserta and deleta are very closely related ; in fact, one of the 

 two examples of the former in the Horn collection is really deleta. This 

 specimen is from the vicinity of San Diego, in which region deleta seems 

 to occur more frecjuently than elsewhere, while the type of deserta — the 

 specimen bearing the label — is from the Mojave Desert. In this latter 

 the eyes are separated on the vertex by a distance subequal to half the 

 length of the pronotum on the median line, and the third antennal joint is 

 fully twice as long as wide, while in deleta the eyes are separated by a 

 distance equal to two-thirds the length of the pronotum, and the third 

 antenna) joint is less slender, never quite twice as long as wide. There 

 is virtually no difference in the form of the anterior tibiae of the male in 

 these two species, notwithstanding Horn's remark, nor do I believe the 

 elytral costte can be depended on as a mark of distinction. 



There is a manifest inconsistency in the Horn tabulation of groups in 

 this genus, in which it is stated that the species of Groups H-V have the 

 " disk of the thorax irregular, median line more or less sulcate." This 

 character completely fails in Group V, which includes the species we are 

 now considering. A better character for the separation of this group 

 would be the pubescence of the entire upper surface, which is always very 

 obvious in even fairly well preserved specimens, and which does not exist 

 elsewhere in our species. 



Chrysohothris smaragdula, n. sp. — Moderately elongate, bright 

 green above, dark green, with slight violaceous tint, below, surface 

 moderately shining, glabrous. Antennie with first three joints green, 

 outer joints piceous, feebly metallic, gradually decreasing in width, third 

 joint nearly as long as the next three. Front feebly convex, strongly, 

 closely punctate ; clypeus broadly triangularly emarginate, arcuate each 

 side. Prothorax nearly twice as wide as long, sides straight and parallel 



