156 TRANS. ST. LOUIS ACAD. SCIENCE. 



One 6* ; three $ . The sexual distinctions, especially the 4th, 

 are very striking. 



[PhytOdietllS distinCtUS, Cress.. Trans. Am. Ent. Soc. iii. p. 166.]—$. — 

 Differs from {vulgaris, normal] $> only as follows : 1. The disk and anterior 

 edge of the clypeus, a narrow orbit interrupted for a short space just behind 

 the vertex and also on the cheeks, the palpi, and all but the tip of the mandi- 

 bles, are yellowish-white. 2. The antennae are pale brown exteriorly from 

 the 2d joint of the scapus inclusive to their tip. 3. The carina of the metatho- 

 rax are entirely obsolete ; only the tegulae, a dot before them under the hume- 

 ral suture and another above it near its tip, the tip and basal £ of the sides of 

 the scutel, the whole of the metathoracic scutel, and a capillary line leading 

 from either scutel respectively to the front and hind origin of the posterior 

 wing, and near the tip of the metathorax a broad, subequal, lunate band,, 

 are white; and there are no rufous markings. 4. Abdominal joint 1 is 2^ 

 times as long as wide, twice as wide behind as before, its sides straight save 

 that there is an obtuse salient angle near the base, and that halfway to the 

 tip the tubercles project a little laterally; carinae commencing at the apex 

 of the salient angle and fading out opposite the tubercle. Only the tip of 

 ventral joints 1-5 (not 1-6) is white. Ovipositor pale rufous. 5. The legs 

 are pale rufous immaculate, save that in the front legs the basal h. of the 

 coxa? and the tarsal claws, in the middle legs the last tarsal joint, and in 

 the hind legs the terminal \ of the tibiae and the whole of the tarsus, are 

 fuscous. Length $ .33 inch. Front wing ? .29 inch. Ovipos .15 inch. 



One ? ; 6" unknown to me. Remarkably like the preceding, 

 and yet quite distinct by the simple coloration of the legs. The 

 front trochanters are very slightly tinged with yellow, so that the 

 d 1 will probably have them yellow. 



CRYPTOCENTRUS, new genus (= Cryptocentrum, Kirby?). 



Head with the face triangularly hunched under the antennae 

 Clypeus short, wide, and transversely truncate for its whole 

 breadth. Mandibles bidentate. Antenna? slender, about as long 

 as the body, the 1st joint laterally and obliquely truncate ; the 

 joints of the flagellum rather long. Thorax with the parapsidal 

 grooves subobsolete, the metathorax with the carinate areas 

 mostly distinct, scutel trapezoidal. Abdomen polished, very mi- 

 nutely punctate, with no striaj or tubercles, elongate-oval, .... 

 6*, subpetiolated 9, the 1st joint rather long and tapered gradu- 

 ally to its base, joints 2-6 slowly shorter and shorter, 7 and 8 al- 

 most retracted so that the tip of the abdomen is almost squarely 

 truncate. Venter d 1 . • • . , $ slightly depressed towards the 

 base, strongly compressed and protuberant towards the tip, and 

 longitudinally carinate throughout, the 6th ventral squarely trun- 



