18G4.] ^ 289 



femora aud tibiae more or less dusky ; posterior femora, except base, 

 their tibite, except a pale anuulus near the base, and most of their tarsi, 

 blackish. Abdomen scarcely as long as the head and thorax, subovate, 

 depressed, rufous, apical half of the 3rd, and the remaining segments, 

 black, the extreme apex with a transverse white spot; basal segment 

 strongly arcuated, slightly dilated towards the tip, bicarinated above, 

 and uneven at tip ; 2nd segment somewhat rugose. Length 4 lines ; 

 expanse of wings 61 lines. 



Sab. — Pennsylvania. Mr. Tryon E-eakirt. 



Closely allied to H. dimidlatm (Europe), but the antennfe are longer 

 aud the mesothorax is entirely black. 



Genus CRYPTUS, Fabr. 



Section 1. — Scutellum and abdomen black Sp. 1 — fi 



" 2. — Scutellum pale : abdomen black Sp. 7 — 8 



" 3. — Scutellum witli pale markings ; abdomen red or red and 



black Sp. 9—1(1 



" 4. — Scutellum black; abdomen red or red and black Sp. 11 — 24 



" 5. — Thorax, scutellum and abdomen yellowish-red Sp. 2,5 



Section 1. 



1. Cryptus robustus. n. sp. 



Black, shining, abdomen very robust; wings fuliginous, with a bluish gloss; 

 legs rufous, jiosterior femora undulate, constricted at tip ; metathorax with a 

 transverse central area. 



Female. — Very robust, deep black, shining ; face broad, minutely 

 punctured, with a subobsolete, obtuse, rounded tubercle beneath the 

 antenna?, the front just behind the antenuoe deeply excavated, the sur- 

 face somewhat wrinkled ; the orbits behind very narrowly and subobso- 

 letely yellowish ; clypeus polished, its lateral and apical margins much 

 depressed, leaving the middle prominent ; mandibles also polished, with 

 a few punctures ; palpi blackish, fulvous at base ; antenna? nearly as 

 long as the body, setaceous, slightly involute, black, the 3rd joint rather 

 longer than the 4th and 5th together, the basal joint robust, tinged 

 with rufous within. Thorax shining above, the dorsal lines deep, but 

 not reaching the posterior margin ; mesothorax feebly punctured, the 

 pleura very densely punctured, somewhat aciculate, a spot beneath the 

 posterior wings and the space between the anterior and middle coxae, 

 polished ; scutellum convex, polished, deeply impressed in front ; post- 

 scutellum also polLshed; metathorax very densely punctured, opaque, 



