550 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



Type locality. — San Miguel, Hidalgo, Mexico. 



Type.— C&t. No. 23936, U.S.N.M. 



Host. — Eciton (Acamatus) melanocephalum, subspecies xipe Wheeler. 



The ants, which formed the type series of the subspecies, were 

 taken in the act of raiding a nest of Pheidole vasleti, var. acolhua 

 Wheeler, and I picked up the beetle without noticing that it was dif- 

 ferent from the ants. 



Unfortunately I took but one specimen of this anomalous species, 

 and, not wanting to risk dissecting out the mouth parts, have ven- 

 tured to describe it only as seen under the binocular. The mandibles 

 are tightly closed and their structure can not definitely be made out. 

 The segments on the posterior portion of abdomen are very indistinct. 

 The first seems to be as long as the remaining ones together. 



The actual systematic position of the species is doubtful. Because 

 of the structure of the mouth parts and the tarsal formula I have 

 placed it near the tribe Myrmedoniini in the Aleocharinae. 



In general habitus, the structure of the antennae, the constricted 

 thorax, the curious modification of the metanotum with its basal and 

 declivous portions, the petiolate abdomen, and in pilosity and color 

 Crematoxenus is quite the most ant-like beetle that I know of. 



After I had failed to distinguish it, both in the field and when 

 mounting up the type series of ants, two preparators at different 

 times mounted ants from the vial and the beetle was noticed only 

 when there remained but three ants, when the twisted appearance 

 of the specimen attracted attention. Since mounting the specimen 

 I have exhibited it to several entomologists as a new ant or as a new 

 Proctotrypid without being contradicted. 



The abdomen in the specimen is slightly elevated and probably 

 is carried that way in life. 



Tribe MYRMEDONIINI. 

 ECITOPHYA CONSECTA, new species. 



Length, 5 mm. Form elongate, slender; color brown, opaque, 

 densely and finely punctate throughout and with moderately long, 

 suberect hairs on head, body, and appendages. Head three times as 

 long as broad, broadest behind eyes and narrowed toward occipital 

 border; strongly and broadly impressed from immediately back of 

 eyes to half the distance to occipital border. Antennae about half 

 as long as the body, somewhat thickened apically; the first joint 

 about five times as long as the second and about two-thirds as long 

 as the third, fourth joint one-fourth as long as the third, remaining 

 joints each slightly longer than the one preceding; apical and penul- 

 timate joints subequal. Prothorax twice as long as broad, the dorsum 

 with a strong entire median groove and large depressions laterally. 

 Elytra together about one and one-third times as long as broad, 



