ry 
1914] Mann—Myrmecophilous Insects from Mexico Lie 
cumbent yellow hairs; the posterior from above is round, with flat surface and with- 
out hairs. The median portion of the abdominal dorsum is glabrous; the rest of 
the body, legs and antenne are thickly though microscopically pilose, the antennz 
more densely than the other parts. 
Described from three specimens taken at San Miguel in nests of 
Tapinoma sessile Say* 
This species is very similar to M. lugubris Casey which I took 
some years ago in Orcus Island (Puget Sound) with colonies of 
the same host ant, but differs in the fine punctation of the head 
and thorax, which in lugubris are reticulate. The thoracic de- 
pression in tapinomatis is deeper and narrower than in lugubris 
and the abdomen is proportionally much more slender. 
Family PsELAPHID. 
Pilopius major sp. nov. 
Female: Length 3.25 mm. Color throughout brown. Head narrower than 
thorax; from the front twice as long as broad, the sides in front of eyes sub-parallel; 
vertex foveolately impressed at sides, a thin median carina extending to between 
the antennal tubercles. Eyes large and convex, located at the posterior third of 
head. Antenne thick, theefirst joint slightly bent at base, as long as the two 
succeeding joints together; third joint smaller than the fourth, which is larger 
than the fifth; joints 5-11 sub-globose, equal in size; apical joint one and three- 
fourths times as long as penultimate, thickened. Prothorax a little longer than 
broad, narrowed in front, with rounded sides; base compressed above, with median 
and lateral foveze; the former is elongate, extending one-third the distance to apex. 
Elytra together longer than broad, the sides rounded; humeri elevated into thick 
ridges; discal strie broad, slightly arcuate, extending three-fourths the length of 
elytra. Abdomen narrower than elytra and about the same length. 
Body shining everywhere, finely punctate, with a thin covering of short, scale- 
like hairs which are more dense in the pronatal foveze and on the occiput and 
posterior elytral margins. 
Described from specimens taken at San Miguel with Prenolepis 
(Nylanderia) mexicana Forel., one from each of three colonies. 
The maxillary palpi are short and proportionally smaller than in 
the other species of the genus that I have seen. This species 
belongs to the group which includes pulvereus Lec., ocularis Csy. 
and abruptus Csy., in the latter two of which only the males have 
been described, but is considerably larger than any of these. The 
pubescence is much sparser than in pulverius. The other species 
whose hosts are known are guests of different species of Aphzeno- 
