REHN AND HEBARD 243 



As a whole Psychoniastax appears to be a generalized member of 

 the genera group to which Morsea and Masyntes belong, not as 

 specialized in numerous points of structure as Morsea, and also 

 well distinct from Masyntes. Superficially there is quite a little 

 resemblance to Episactus, particularly in the general form, out- 

 line of head, and other features, but more than superficial exami- 

 nation of the two genera shows they have no real relationship. 



Genotype. — Psychomastax jjsylla new species. 



Psychomastax psylla'* new species (Plate XI, fig. 1; XII, figs. 1, 5, 9, 11, 15, 

 17 and 19; XIII, figs. 1, 5, 7 and 9.) 



Type. — cf ; Strawberry Valley, San Jacinto ^Mountains, River- 

 side County, California. Elevation, 6500 to 7500 feet. August 

 27, 1909. (J. Rehn; in spiny chaparral.) [Hebard Collection, 

 Type no. 474.] 



Size small: form apterous, elongate subfusiform, abdomen subcompressed : 

 surface not polished, on the thorax and abdomen with numerous, small, sub- 

 obsolete strumosities. 



Head with its dorsal length not more than four-fifths of that of the disk of 

 the pronotum; occiput arcuate, ascendent to the vertex, which is plane -with 

 the fastigium, the occiput, vertex and fastigium with a weak but continuous 

 medio-longitudinal carinulation, the vertex regularlj* narrowing to the fas- 

 tigium, which projects but httle cephalad of the eyes, in width it is relatively 

 broad, subequal to one-half the dorsal width of one of the eyes, the cephaUc 

 margin truncate, the lateral angles very narrowly rounded, the cephalic and 

 lateral margins of the fastigium cingulato-carinulate, these elevations extend- 

 ing caudad around the internal margin of the eyes: fastigio-facial angle rec- 

 tangulate when seen from the side; facial line regularly arcuate when seen from 

 the side, decidedly retreating; frontal costa relatively broad, subequal except 

 that it slightly widens dorsad a short distance ventrad of the fastigio-facial 

 angle and is also weakly constricted a short distance ventrad of the ocellus, 

 V-sulcate except in the widened dorsal portion, where the floor of the costa is 

 broadly elevated within its margins; lateral facial carinae prominent, sub- 

 parallel ventrad of the eyes, continuofl around the cephalic margin of the eyes 

 as similar ridges which reach to the fastigium: eyes large, {)rominent, in depth 

 nearly twice that of the infra-ocular portion of the genae, oval in basal outline: 

 antennae no longer than the depth of the face, composed of twelve articles, the 

 six proximal joints approximately subequal in length, those distad shortened, 

 distal half of the antenna weakly incrassate and subdepressed, apex blunt, 

 tooth on ventral surface of ninth segment. 



Pronotum of normal type, expanding caudad, no distinct dorso-lateral 

 carinae present, medio-longitudinal carinulation weak but continuous; no 

 transverse sulci present; cephalic margin of disk weakly arcuate, caudal mar- 



^ A flea, in allusion to the jumping aliilitj' of the species. 



TR.\NS. AM. ENT. SOC, XLIV. 



