1938 ] 
North American Nilidulidse 
99 
specimen in the collections of the British Museum and the 
writer measures 4.0 mm. 
Holotype, male, from the Bronx, New York, Aug. 15, 1896, 
in the writer’s collection. Paratypes from Massachusetts, 
Pennsylvania, New Jersey, Georgia, Illinois in the collections 
of the Museum of Comparative Zoology, American Museum 
of Natural History, C. A. Frost, and the writer. Specimens 
have been seen from as far west as Texas and north to 
Michigan. 
Subg. Lepiarcha Sharp 
Lepiarcha Sharp, 1891, Biol. Centr. Amer. Col. II, pt. 1 : 385 
(type Cryptarcha omositoides Reitter) . 
Cryptarchula Ganglbauer, 1899, Kaf. Mitteleur. 3 : 551 
(type Cryptarcha ( Cryptarchula ) imperialis Fabr.) 
This subgenus contains at least the European imperialis 
and its allies, the Central American omositoides Reitter, and 
the following species. 
Prosternal process greatly expanded at tip (fig. 6) gila n. sp. 
Prosternal process only slightly expanded at tip (fig. 8) 
concinna Melsh. 
Cryptarcha gila n. sp. 
Elongate, piceous above, testaceous beneath. The anterior 
half of head, lateral fourths of the pronotum, epipleurae, and 
elytral fasciae testaceous. The upper surface closely punc- 
tate, finely pubescent, with numerous pale setae. The setae 
are arranged in eight rows on each elytron. The under sur- 
face obsoletely punctate and more sparsely pubescent. The 
prosternal process expanded, as shown in fig. 6. Anterior 
and middle coxae pale testaceous. The mandibles are of 
equal length and notched at tip. Length 2. 5-3.3 mm. 
Holotype male, allotype, and paratypes from Wheatfields 
near Globe, Arizona, May 4, 1934, D. K. Duncan, in the col- 
lection of the author. Paratypes with similar data in the 
collection of H. C. Fall. Also paratypes from Bakersfield, 
Calif, in the E. C. Van Dyke collection of the California 
Academy of Sciences. 
This species is more elongate and a little longer than 
concinna. The apices of the elytra are more pointed than in 
