46 bulletin: museum of comparative zoology. 



one-half or more times as long as thick, those toward the apex becoming almost 

 quadrate, probably about 40 joints in all. Mesonotum and pleurae smooth. 

 Metathorax short, declivous and obtusely rounded above. Abdomen strongly 

 petiolate, the first segment fully one and one-half times as long as the meta- 

 thorax, very slender at the base, and evenly expanded toward the tip; second 

 half as long as the first and much expanded as seen in lateral view; remaining 

 segments forming a pointed, ovate body. Ovipositor at least as long as the 



body and perhaps longer 

 as its tip is not visible. 

 Legs, more especially the 

 posterior pair long and 

 slender. Posterior coxae 

 very long, reaching to be- 

 yond the middle of the 

 Fig. 32. — Leptobatopsis ashmeadii, sp. nov. Type. abdominal petiole, their 



trochanters extending to 

 beyond its tip. Femora short and stout, the tibiae as long as the femora and 

 trochanters together. Wings hyaline, with light colored stigma and veins; 

 stigma lanceolate; first section of the radius only about one-third as long as the 

 second which is recurved in conformity with the costa, making the apical part 

 of the marginal cell long and narrow. Median and submedian cells of equal 

 length; discoidal nervure broken distinctly below the middle; discocubital 

 vein evenly arcuate; areolet small, rhomboidal, distinctly petiolate above. 



Described from one specimen collected at Station 13B by Mrs. W. P. 

 Cockerell. Type in the Amer. Mus. Nat. Hist. 



This is an undoubted acoenitine, but seems to be midway between 

 Leptobates and Leptobatopsis, the latter genus perhaps being closer. 

 Unfortunately Ashmead's description of Leptobatopsis (Proc. U. S. 

 Nat. Mus., 1909, 23, p. 47, is very short and the type species there desig- 

 nated has never been described. However, the peculiar elongation 

 of the abdomen is undoubtedly the same although the form of the 

 areolet is more like that of Leptobates which has a nearly sessile abdo- 

 men. 



The extensive group of Lissonotini has not hitherto been found in 

 the fossil state, but I have discovered three species of Lampronota in 

 the present collection. 



Lampronota Haliday. 



Key to the Florissant species of Lampronota. 



1 . Larger species, length 9 mm; median and submedian cells of equal 



length; areolet present L. pristina, sp. nov. 



Smaller, 5 mm 2. 



