AMERICAN HYMENOPTERA. 81 



Dictynna cordoviensis, n. sp. 



£. — Length 0.18; br. wings 0.42 inch. — Antennae rather longer than head 

 and thorax, 10-articulate, slightly clubbed, as in Athalia, joints enlarging to 

 apex, quite bent, as in Sciapteryx, final joint obtuse. Eyes quite protuberant, 

 approaching below. Head narrow, concave behind, no distinct marginal edge 

 on border of occiput, which round towards neck from eyes; a deep channel on 

 each side of ocelli and a basin below the lower ocellus ; clypeus depressed, nar- 

 row, very shallow, margin straight; labrum rather pointed; mandibles with no 

 inner teeth. Abdomen as in Hylotoma, short, flattened, obtusely rounded at 

 apex. Spurs of tibiae short; claws simple. Wings broad ; one marginal, appen- 

 diculate cell ; first submarginal long, ovate, its nervure dividing from second 

 broken, third longer and wider than second; first recurrent nervure received 

 near base of second cell; lanceolate cell petiolate, very small, placed opposite 

 the inner apical nervure ; under wing with a large appendiculate cell, one in- 

 ner cell beneath the marginal, no lanceolate cell, outer cells all open. Head 

 and antennae black; metathorax, pectus and abdomen above, mostly blackish ; 

 labrum, mesothorax, scutellum and pleura, yellow-brown; middle of each seg- 

 ment of tergum and most of venter, indistinctly brown ; coxae, femora, anterior 

 tibiae and tarsi, yellow-brown; remainder of legs blackish : wings smoky, sub- 

 hyaline, a minute black dot in middle of brachial and second submarginal 

 cells. 



Cordova, Mexico. (Prof. Sumichrast.) One 9 specimen. 



Dictyima politus. n. sp. 



%. — Length 0.18; br. wings 0.42 inch. More slender than D. cordoviensis ; 

 form of head and sculpture the same; (antennae wanting); head and body 

 shining black; legs yellow-brown, tips of femora and tarsi blackish; wings 

 subviolaceous, neuration as above. 



Cordova, Mexico. (Prof. Sumichrast.) One % specimen. 

 Hemichroa albido-variata, n. sp. 



9 . — Length 0.35 ; br. wings 0.70 inch. — Color black, the edge of nasus, labrum 

 tegulae, collar, anterior angle, a stripe on each side of anterior lobe of thorax, 

 and a band across four basal segments of tergum, wax-white ; edges of the 

 three apical sagments waxen; legs whitish, a black band on the hinder femora 

 and the hinder tarsi blackish above. Antennae moderate, not slender, filiform, 

 joints of nearly equal length and size. The two basal joints very short and 

 deeply set, third rather the stoutest; lower ocellus in a deep basin, nasus deep- 

 ly notched ; lower half of face and the pleura with cinereous hairs : remainder 

 of body shining; the head nearly as wide as thorax; body quite thick and 

 stout; the first tarsal joints rather arcuate, with processes beneath. Claws 

 cleft; wings hyaline, faintly smoky, stigma and costal nervure brownish ; 

 second submarginal longest, receiving the two recurrent nervures, third of 

 nearly equal width ; lanceolate cell contracted ; the under wing with two inner 

 cells, lanceolate cell retracted. 



Texas. One specimen. (Coll. Am. Ent. Soc.) 

 Hemichroa fraternalis, n. sp. 



% .—Length 0.30 ; br. wings 0.60 inch.— Shining black, more slender than 

 albido-variata; tegulae and anterior angle piceous ; legs pale, with the basal one- 

 third of femora and the coxae black, hinder legs mostly black; sculpture and 

 wings as in albido-variata, of which it is very probably the male. 



Texas. (Belfrage.) One specimen. 



TRANS. A51ER. ENT. SOC. IV. (11) MAY, 1872. 



