264 GEO. H. HORN, M. D. 



faint tendency to strigosity at the sides. Elytra as wide as the thorax, sides 

 feebly arcuate, apices obtuse, sutural angle obtuse, sutural stria moderately 

 impressed, surface transversely strigose, the strigse not deep nor closely placed, 

 pubescence rather coarse. Body beneath somewhat paler than above, finely 

 punctulate, femora finely strigose. Hind tibiae with rather long spurs, the 

 inner equalling in length the first joint of the tarsus, fimbriate at tip with 

 unequal spinules. Length .08 inch; 2 mm. 



A small species easily known by the characters in the table, occur- 

 ing in Georgia and Florida. 



Pft. pusio Lee. (Catops). — Castaneous or piceous, moderately shining, pubes- 

 cent. Form of oblitus which it resembles in most of its characters and differ- 

 ing in having the hind angles of thorax nearly rectangular, the sutural stria 

 more deeply impressed and the inner spur of the hind tibiae not longer than 

 half the first joint. Length .06— .08 inch ; 1.5—2 mm. 



I have seen two specimens clearly identical from California and 

 Vancouver, but I have provisionally placed with them some specimens 

 from the Michigan and Lake Superior region, which diflfer in being a 

 little more shining and with the strigosity of the elytra slightly oblique. 

 It has been observed in consobrinus that similar differences do not 

 seem to be specific. 



Pt. parasitns Lee. (Catops). — Piceo-rufous or castaneous, shining, clothed 

 with fine pubescence, form oval, narrower posteriorly. Head sparsely punctate. 

 Antennse with eighth joint not narrower than the ninth and at least half as 

 long. Thorax a little less than twice as wide at base as long, sides moderately 

 arcuate and gradually narrowing to the front, hind angles subrectangular, base 

 very feebly bisinuate, surface moderately densely punctate, slightly strigose 

 near the sides. Elytra gradually arcuately narrowing from the base, apex 

 obtuse, sutural angle rounded, sutural stria moderately deeply impressed, sur- 

 face nearly transversely strigose, the strigae rather coarse and distant. Body 

 beneath finely punctate, femora strigose. Tibise fimbriate at tip with unequal 

 spinules, the spurs of the posterior tibise short. Length .08 inch; 2 mm. 



The antennal character serves to separate this and the next species 

 from those which precede, but its importance generically seems to 

 have been exaggerated. 



Occurs from New York to District of Columbia, in the nests of a 

 black ant. 



Pt. brachyderns Lee. (Catops). — Castaneous, moderately shining, finely 

 pubescent, form broadly oval rapidly narrowing from the base of the elytra. 

 Head finely punctate. Antennae as in parasitus. Thorax much more than 

 twice as wide at base as long, sides arcuate and raj)idly narrowing to the front, 

 base sinuate on each side, hind angles rectangular, slightly prolonged, surface 

 finely not densely punctulate on the disc and sides. Elytra but little longer 

 than wide at base, sides feebly arcuate rapidly narrowing posteriorly, apices 

 subobliquely truncate, sutural stria moderately impressed, surface finely and 

 closely transversely strigose with a tendency to become simply punctate near 

 the suture. Body beneath not densely punctulate, femora substrigose. Tibiae 



