OF WASHINGTON. 29 



articulation of the antennae, the latter 12-jointed; thorax flattened 

 above, with some elongate punctures ; abdominal petiole quadrate, 

 with a number of irregular depressions above, 



Acanthostichus Mayr 



(Type, Typhlopone serratula Smith) 



Unknown (see $ and cO Ctenopyga Ashmead 



3. Wingless 4 



Winged 5 



4. Head oblong, not bilobed, without ocelli, the eyes minute; thorax 



with the meso- and meta-notum not divided by a distinct suture, 

 together a little wider than long; abdominal petiole wider than 

 long, trapezoidal, subconvex above Acanthostichus Mayr 



5. Front wings with three cubital cells, a distinct stigma, and with the 



marginal cell more or less open at apex ; submedian cell shorter 

 than the median; pygidium with the apical margin armed with a 

 row of spines; head oblong, the eyes and ocelli present; claws 



simple Ctenopyga Ashmead 



(Type, C. townsendi Ashmead) 



6. Marginal cell open at apex; flagellum rather stout, subclavate, the 



joints after the first a little wider than long; disk of mesonotum 

 posteriorly flattened, the parapsidal furrows not distinct, 



Acanthostichus Mayr 



Marginal cell usually closed at apex; flagellum subfiliform, the joints 

 a little longer than wide; disk of mesonotum subconvex, the par 

 apsidal furrows and the humeral furrows present, 



Ctenopyga Ashmead 



Ctenopyga townsendi n. sp. (fig. 4). 



$. Length 5 mm. Castaneous, the head piceous-black, smooth and 

 shining, the eyes well developed, oval, facetted, placed slightly beyond 

 the lateral middle, the scape of the antennas and the legs rufo-testaceous, 

 the flagellum clavate, brownish, becoming yellowish at apex, the club 

 distinctly yellowish. The oblong head is slightly wider than the thorax 

 and about twice as long as wide, the hind margin only slightly and 

 broadly emarginate, ocelli small, arranged in a triangle; the face has a 

 median grooved line anteriorly between the antennae; the antennal 

 scape is depressed, somewhat broadened, and reaches to the base of the 

 eyes, while the flagellum is clavate, thickened towards apex, the funicle 

 joints being wider than long; the mandibles are large, triangular, with 

 a broad, sharp, but edentate masticatory edge, the edge bordered with 

 a few punctures ; the thorax is a little more than four times as long as 

 wide, slightly narrowed posteriorly, the anterior margin rounded, the 

 posterior margin sharply but slightly obliquely truncate, the pro-, 

 meso-, and meta-notal sutures distinct, the mesonotum a little longer 

 than the pronotum, the scutellum well differentiated, with a crenate 

 furrow across the base, the metanotum obtrapezoidal ; the mesosternal 



