440 ENTOMOLOGICAL NEWS [Dec.,’12 
several short hairs and one rather long one; occiput convex, slight- 
ly emarginate on each side where the occipital bands meet the margin. 
Head widest across the trabeculae-like processes. 
Thorax long; prothorax trapezoidal, with diverging sides and 
straight posterior margin; a hair in each posterior angle and two 
on the posterior margin. Metathorax shorter aud broader than 
prothorax with auterior angles broadly rounded, sides converging and 
posterior margin concave; a short hair on the lateral margin and 
two longer ones on each side on the dorsal surface; also two near the 
meson. Legs poorly developed. ; 
Abdomen subovate, widest at the second and third segments and 
regularly diminishing to the seventh; last segment protruding with 
two rather long hairs and several shorter ones; also a row of prom- 
inent hairs across each of the other segments, those in the mesal 
region being more closely set. Color pale yellow. 
Female. Antennae short (Fig. 4a), ordinary, with segments of 
nearly equal length. Trabeculae-like processes longer and more acute 
than in the male. Abdomen more developed, subquadrilateral; widest 
at second segment and diminishing slightly to the sixth, with seventh 
segment narrowed and the last narrow, bilobed; two chitinized hook- 
like processes apparently arising from the sixth segment (Fig. 4b). 
Measurements: 2 .96; 8 .8o. Length Width 
Male Female Male Female 
Eleadier pees aati. 24 26 28 132 
ABIES So.gib-on Coa or 14 .16 24 28 
Aibdomenteeseeescas 42 54 36 .40 
Trichodectes californicus Chapman. (Pl. XX, Fig. 2). 
With some hesitation I refer several specimens, male and 
female, from Dipodomys merriami, a pocket rat (Arizona), 
to this species. The females of the specimens in hand are 
very similar to 7. californicus, but have fewer hairs on the 
thorax and abdomen, less than half as many in the case of the 
metathorax. The male, which has heretofore been unknown, 
differs greatly from the female in the shape of the head and 
in the antennae. The temples are nearly square, with two 
short broad spines on the posterior angle. The antennae are 
very striking, being long enough to reach well back on to the 
abdomen; first joint large, deep set, a little longer than either 
of the succeeding joints, with a prominent tooth-like appendage 
midway on the inner side; second and third joints long and 
narrow and about equal in length; two short heavy teeth and 
several longer spines on the tip of the last segment (Fig. 2a), 
