452 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 57. 



malar furrow obsolete; malar space long; clypeus transverse; thorax 

 depressed; prescutum completely defined; the propodeum long and 

 trimcate apically, in lateral view rectangular in outline, the spiracle 

 elongate, slightly basad of middle; areolet wanting; legs very stout; 

 abdomen more or less compressed apically; hypopygidium not 

 prominent; ovipositor long, well exserted. 



Some authors have considered that the areolation of the propodeum 

 was a generic character, but examination of the species of A'plomerus 

 and Odontomerus shows that the carinae which define the middle area 

 may become obliterated, and the author does not consider that this 

 character should be used for generic purposes. The two genera 

 here recognized are readily separated by the following table. 



TABLE TO THE GENERA. 



1. First torgite sub-petiolate, the spiracle far removed from the base; hind femur 



armed with a tooth beneath Odontomerus Gravenhorst. 



First tergite siibsessile, the spiracle very close to the base; hind femur not dentate. 



A'plomerus Provancher. 



Genus APLOMERUS Provancher. 



Platysoma Provancher, Can. Ent., vol. 17, 1885, p. 115 (not Latreille). 

 Aplomerus Provancher, Addit. faun. Can. Hym., 1886, p. 119. 

 Anodontomerus Ashmead, Proc. U. S. Nat. Mus., vol. 23, 1900, p. 61. Geno- 

 type. — Platysoma tibialis Provancher. (For all names.) 



Ashmead, under the assumption that Aplomera Macquart pre- 

 occupied Aplomerus Provancher, proposed the name Anodontomerus 

 for Provancher's genus. Inasmuch as the spelling is different and 

 the International Commission on Zoological Nomenclature permits 

 the retention of names when the spelling is as different as the two 

 cited above, the name Aplomerus is used instead of Ashmead's sub- 

 stitute. 



The genus Aplomerus is closely related to Odontomerus and agrees 

 with it in habitus, but may be readily separated by the characters 

 given in the above table. 



From its affinities and structure the species are no doubt all para- 

 sitic on wood-boring Coleoptera. 



Generic cliaracters. — Antennae almost as long as the body; greatest 

 width of the posterior orbits greater than or subequal with the length 

 of the eye; clypeus narrow, limited above by the weak supraclypeal 

 suture, not depressed apically; thorax depressed; propodeum longer 

 than the scutum, truncate posteriorly, the lateral dorsal angles 

 prominent but not toothed, completely or nearly completely areolated 

 or with the two median carinae obliterated; hind coxae rather short; 

 femora swollen, not toothed; tibiae incrassate, the middle pair 

 twisted; claws simple; venation about as in Odontomerus; abdomen 

 subsessile; the first tergite without prominent carinae, its spiracles 



