Pomona College Journal of Entomology 441 



peculiar birostrate appearance : basal segment of antenna; large and broad ; 

 second segment large, but smaller than first ; third segment very long. Facial 

 cones entirely wanting; face slightly swollen under insertion of antcnnx. 



This genus is very closely related, apparently, to the European genu> 

 Baclcriccra I'uton, and in fact may be identical. The absence of the facial 

 cones and the unusual length of the third antennal segment ally the two 

 genera very closely. Low's description of Baclcriccra gives as characters of 

 the vertex : "Wrtex half as long as width between eyes ; with two flat, broad 

 impressions, rounded anteriorly and extending well forward ; emarginate at 

 median suture ; posteriorly ahuost plane." It is (|uite probable that in the 

 formation of the head the two genera are closely related. L'ntil the European 

 form becomes available for study, we should allow Rhinopsylla to stand as a 

 very closely allied genus. The genus Baclcriccra can scarcely be erected into 

 a subfamily, as distinct from Triocinac, as has been attempted by some, since 

 there is too close a relationship existing between them. 



Synopsis of the Genus Rhinopsylla 

 .\. Fore femora distinctly enlargc<i. ciim])ressed, and curved. Third antennal 

 segment thicker midway than succeding segments. Wings >lender, more 

 than three times as long as broad. Rh. schwarzii Riley. 



\.\. Fore femora not distinctly enlarged, compressed nor curvc<l. Third 

 antennal segment slender, not thicker than succeeding segments. Wings 

 only two and a half times as long as broad. 

 r. I'.irostrate appearance of head very pronounced; basal segment.- <A 

 antenna almost as broad as ends of projecting rostra. liody black. 



Rh. antcnnata Crawf. 



BB. Birostrate appearance less pronounced ; basal antennal segments 



smaller; sulcate impressions of vertex more pronounced, limly orange. 



Rh. antcnnata f<roxiwa Crawf. 



Rhinopsylla schwarzii Riley 

 Proceedings of the I'.ii'l.>,s;ic;il Society of Washington, \oI. 11. 1X82-84. 

 page 77. 



Rhinopsylla antcnnata (Crawf.) 



(Syn. Paratrioza antcnnata Crawf.) 



(Fig. 153, C, D, U; 155, S) 



Length of body 1.8 mm.; length of forewing 1.7 nim. ; greatest width 1.1 



mm. ; width of vertex between .44 mm. ; with eyes .7i mm. General color 



black ; abdomen white ventrad ; antennae and tarsi lighter. 



Head not deflexed, with eyes about as broad as thorax, impunctate; broad 

 posteriorly, when viewed laterally, and tapering toward insertion of antenn.t. 

 Posterior margin of vertex arcuate, scarcely elevated narrowly ; vertex not 

 raised plate-like; discal area with a distinct sulcate impression extending for- 

 ward and toward lower margin of eye on each side, anterior margin deeply 

 vmarginate at median suture, making head appear strongly birostrate. An- 



