HEMITTDEOPSYLLA. 302 



spinis 5, et spinulis 5 inter spinas armatse ; aubtus inermes, rotundatse ; eorum calcaria modice longa, 



intermedia longiora. Tarsi graciles, subtns carinati, a latere recti. Abdomen apice attenuatum. 

 $ $ . Ovipositor subrectus, tantum imo apice minute incurvus, ac siibito acuminatus, subtus denticulatus - T 



valvae inferiores tota longitudine angustissime, apice paulo latius conspictise. 

 S 6 • Lamina supra-analis in medio producta ; eerci teretes, acuti. Lamina infra-geni talis sacculiformis, vel 



convexa, rotundata. 



The general form of these insects is like that of TJdeopsylla, with short thick 

 posterior femora, not narrowly prolonged at the apex ; but they resemble Ceuthophilus 

 in having the anterior tibiae unarmed on the upperside, the intermediate femora with a 

 genicular spine, the intermediate tibiae with two spines above on their upper posterior 

 margin (not two on each margin, as in Udeopsylla), the posterior tibiae rounded and 

 unarmed, beneath furnished at the tip with long spurs (of which the intermediate are 

 much longer than the superior ones), and the posterior tarsi carinated beneath. 



The genus might be regarded as forming only a division of Ceuthcphilus. In any 

 case, the name Hemiudeopsylla ought to be retained for H. genicularis, which is a very 

 peculiar type. 



Synopsis specierum. 



I. 



a. Genicula femorum posticorum conchata. — 1. genicularis, sp. n. 

 aa. Genicula femorum ut solitum sine distinctione. 



b. Major. Caput majusculum ; vertex apice perpendicularis, acute trigonalis, planissimus. — 

 [2. platyceps, sp. n.] 

 bb. Minores. Vertex apice utrinque depressus, rostrum angustum inter depressiones praebens. 

 c. Caput supra fuscum. Femora postica crassiuscula. Ovipositor apice subtus remote 



3-dentatus. — [3. calif orniana, Scudd.] 

 cc. Caput supra luteo-vittatum. Femora apice subgracilia. Ovipositor apice subtus obtuse 

 multicrenulatus. — 4. forreriana, sp. n. 



II. 



a. Tarsi postici subtus a latere recti. 



b. Pronoti lobi laterales postice rotundato-angulati. — [genicularis.] 

 bb. Pronoti lobi laterales postice angulati. — [californiana] ; forreriana. 

 aa. Tarsi postici a latere subtus articulis apice incrassatis.— platyceps. 



l. Hemiudeopsylla genicularis, sp. n. 



J. Crassiuscula, rufa. Vertex antice perpendicularis, brevis, apice supra antennas leviter angulatus, ac 

 tuberculatus. Pronoti lobi laterales margine posteriore vix obliquo, angulis rotundatis. Femora postica 

 subtus in utroque margine confertim denticulato-serrata ; genua concha arliculata basin tibiarum obtegente 

 instructa; heec concha piriformis, convexiuscula, apice hebetata, margine extern * arcuato, in medio 

 dentem obtusam efficiens, margine interno recto. Tibia? posticae rectse, subtus dens« punctata. Calcaria 

 intermedia quam superiora, sesqui-longiora quam metatarsus breviora ; externa quam interna paulo 

 longiora. Tarsi sensim ut in H. forreriana. Lamina supra-analis transverse arcuata. Lamina infra- 



