500 ENTOMOLOGICAL NEWS. [June, 



ing in his collection. 1 then donated this rare insect to the 

 Doctor's collection, as I knew he was working on a catalogue 

 of the Coleoptera of Southwestern Pennsylvania. Before I 

 left the Doctor's home that evening I knew the name of the 

 odd as well as rare Platynus and promised the gentleman that 

 I would keep a look out for more. So far I have found no 

 other, nor do I know of any other person taking it here, and it 

 still remains the only specimen in the Hamilton collection, 

 which is now in the Carnegie Museum. 



Platynus larvalis L/econte. During my collecting in Brown's 

 wood on July 31, 1899, I captured a fine specimen of this 

 strange as well as rare beetle, and as far as the writer's knowl- 

 edge is concerned it is the first specimen taken in this part of 

 Pennsylvania. This species in life is far less active than P. 

 caudatus, and though bearing a superficial resemblance to it, is 

 entirely distinct. The specimen was found in a dryer situation 

 where the soil was composed of dry leaves and leaf mould. 



New Scenopinidae from the United States. 



By D. W. COQUILLET, Washington, D. C. 

 Our three genera separate as follows : 



1. First posterior cell closed and petiolate, second submarginal cell at 



least three times as long as distance between apices of third 



vein and of its anterior branch ..... 2 



First posterior cell open, second submarginal cell less than twice as 



long as distance, etc. . . . . . Scenopinus Latr. 



2. Body short and robust, bearing numerous scales (type Scenopinus 



bulbosusQ. S.) Metatrichia n. gen. 



Body elongate and slender, destitute of scales Pseudatrichia O. S. 



Pseudatrichia unicolorn. sp. Black ; apices of knobs of halteres white, 

 legs yellow ; apices of tarsi, of hind femora and both ends of hind tibiae 

 brownish ; front polished ; mesonotum opaque, with rather coarse reticula- 

 tions ; abdomen opaque, the first, fifth and following segments polished ; 

 wings hyaline ; veins brown, last two sections of third vein subequal in 

 length ; costal and subcostal cells brown, an elongate yellowish spot 

 between apices of auxiliary and of first veins ; length 6 mm. 



L,as Vegas, N. Mex. (T. D. A. Cockerell, July 19), and 

 Colorado. Two male specimens. Type No. 4711, U. S. 

 National Museum. 



