300 SUPPLEMENT. 



3. Leptogaster crocea, sp. n. 



<3 2 - Antennae inserted distinctly above the middle of the distance between the upper angles of the eyes and 

 the lower margin of the face ; reddish-yellow, the third joint black or blackish ; style short and rather 

 thick, not two-thirds the length of the third joint. Occiput and front opaque yellow, the occiput with a 

 row of well-developed bristles above on each side of the vertical groove ; face silvery-white ; front broad 

 above, the distance between the upper angles of the eyes nearly or quite equal to the length of the 

 antennae without the style. Palpi and proboscis black. Thorax opaque ochraceous-yellow ; mesonotum 

 with three rather broad black stripes (appearing dull brown through the yellowish dust) ; ground-colour 

 of the lower part of the pleura? black. Abdomen only moderately slender ; brownish-red, the distal 

 segments black or blackish, opaque, the venter yellowish. Legs yellow or reddish-yellow, the distal 

 joints of all the tarsi brownish-yellow ; hind femora considerably thickened distally ; empodia reaching 

 to about the middle of the claws. Wings yellowish-hyaline ; furcation of the third vein opposite the 

 base of the second posterior cell, which is only a little more proximal than that of the third ; fourth 

 posterior cell short-petiolate. Hypopygium small. Length 15 millim. 



Hab. Mexico, Acaguizotla and Omilteme in Guerrero (H. H. Smith). 



Nine specimens. The furcation of the third vein may vary to a slight extent. 



4. Leptogaster concinnata, sp. n. 



S . Closely allied to L. crocea, but unquestionably distinct. The third joint of the antennae is reddish-yellow 

 (not black) ; the bristles of the upper occipital orbits are yellower ; the mesonotum is blackish, showing 

 less distinct stripes ; and the hind femora are more slender proximally (in L. crocea the thickening begins 

 more gradually near the middle, while in the present species the thickening is restricted to the distal 

 end, the femora appearing more strikingly club-shaped). Length 16 millim. 



Hab. Mexico, Omilteme and Sierra de las Aguas Escondidas in Guerrero 8000 to 

 9500 feet {H. H. Smith). 



Three specimens. The peduncle of the second submarginal cell is not one-third of 

 the length of the cell, while in L. crocea it is about one-half. This character will 

 distinguish the species from L. favillaceus, Loew. From L. brevicomis, Loew, to 

 which it is more closely allied, the present insect will be distinguished by the length 

 of the style of the antennae (this being shorter than the third joint), and by the second 

 posterior cell not reaching more than one-third of the distance to the cross-vein in the 

 discal cell. 



5. Leptogaster intima, sp. n. 



c? 2 • Distance from the upper ocelli to the root of the antennae about equal to that from the latter to the 

 oral margin. Antennae dark brown, the second joint yellow ; third joint scarcely longer than the first 

 two together ; style slender, about as long as the antenna. Front and face thickly light grey-pollinose. 

 Proboscis reddish-yellow. Occiput thickly light yellow-pollinose ; no bristles on the upper part. Thorax 

 light yellow ; the sides of the mesonotum and its posterior part and the pleurae white -pollinose ; mesonotum 

 shining reddish-yellow, with a median stripe and a contiguous spot on each side shining black, the 

 median stripe continued more narrowly beneath the white dust posteriorly ; pleurae with black spots 

 beneath the pollen inferiorly. Abdomen opaque, nearly black : sides of all the segments and the 

 immediate base of the anterior ones reddish-yellow ; hypopygium small. Legs yellow ; tips of all the 

 femora and of the tibiae, and the tarsal joints, dark brown ; hind femora with a brownish ring beyond 

 the middle, very slender on the proximal two-thirds, moderately thickened distally ; the empodia reaching 

 fully to the middle of the claws. "Wings hyaline, greyish at the apex ; the first vein is broadly separated 



