DLPTEKA. 2 ^9 



6. Mesonotum shining for the most part, with a black stripe and two con- 



fluent spots of the same colour intima, sp. n. 



Mesonotum wholly opaque, for the most part brown dorsalis, sp. n. 



7. Hypopygium very large ; style of antennye thickened and shorter than 



the third joint macropygialis, sp. n. 



Hypopygium small ; style bristle-like and longer than the third joint . . micropygialis, sp. n. 



1. Leptogaster triungulata, sp. n. (Tab. V. figg. 13, 13 a, s .) 



cJ $ . Antenna inserted about midway between the upper angle of the eyes and the oral margin ; black, the 

 second joint somewhat reddish at the tip ; third joint elongate-ovate ; style slender, longer than the 

 third joint, a little thickened distally and ending in a minute bristle. Front and face thickly grey- 

 pollinose. Occiput densely grey-pollinose, with a row of well-developed bristles below the vertex. 

 Thorax densely grey-pollinose; the mesonotum, except the lateral margins and behind, shining deep 

 reddish-black. Abdomen red or orange-yellow, the second segment at its base above, or along the middle 

 for its whole length, and the sixth and following segments, black ; sometimes the abdomen throughout 

 is obscurely blackish ; hypopygium small. Legs deep piceous, the tarsi black ; basal portion of ^ all the 

 tibiae yellow, the hind metatarsi in part reddish or yellowish ; hind femora slender, moderately thickened 

 distally ; empodia very much developed, only a little shorter than the claws. Wings nearly hyaline ; 

 fourth posterior cell petiolate ; the furcation of the third vein takes place beyond the distal end of the 

 discal cell ; proximal end of the second posterior cell about midway between the anterior cross-vein and 

 the proximal end of the third posterior cell. Length 15-16 millim. 



Hah. Mexico, Amula in Guerrero (II. II. Smith). 

 Five specimens. Allied to L. audouim, Macq. 



2. Leptogaster rubida. 



? Leptogaster rubidus, Wiedem. Aussereur. zweifl. Ins. ii. p. 533 l . 



? Leptogaster testaceus, Loew, Centur. ii. no. 10 \ 



2 Antenna? inserted midway between the upper angle of the eyes and the oral margin : yellow, the third 

 joint slightly brownish ; style slender, nearly as long as the antenna. Front and face narrow, clothed 

 with brownish-yellow, at the oral margin whitish-yellow, dust. Palpi rudimentary ; proboscis reddish- 

 yellow. Bristles of the occiput small and yellow, confined to the sides and not reaching across on the 

 upper part. Thorax light yellow, clothed with whitish dust ; mesonotum broadly shining, amber-yellow, 

 the posterior part and the lateral margins deeper yellow, and covered with whitish dust. Abdomen 

 slender : light yellow, the distal segments wholly and the others in part brownish. Legs yellow, the tip 

 of the hind femora, the distal part of the hind tibiae, and the tip of all the tarsal joints, brownish ; hind 

 femora slender, moderately thickened distally ; empodia not reaching to the middle of the claws. Wings 

 hyaline, very narrowly brownish along the apical margin ; furcation of the third vein beyond the distal 

 end of the discal cell ; base of the second posterior cell only a little more proximal than that of the third ; 

 fourth posterior cell long-petiolate. Length 15 millim. 

 Hah. % United States, New York 2 .— Mexico, Northern Yucatan (Gaumer).— South 



Ameeica 1 . 



One specimen. I am not sure that this species is the same as that described by 

 Loew. It appears to have the second submarginal cell longer, as well as the petiole 

 of the fourth posterior cell. Wiedemann's description 1 also is too indefinite for the 



certain determination of the insect. 



2q 2 



