a Family of the Hymenoptera Heterogyna. 261 



the sides of which are acuminated in two prominent teeth, and beneath 

 from the emargination it is canaliculated. In my own collection. 



This species is from St. Vincent's in the West Indies, where it 

 was collected by the late Rev. Lansdown Guilding, from whose col- 

 lection I purchased it. It is remarkably distinguished from all the 

 others by the two teeth of the clypeus and the length and slender- 

 ness of its antennae, besides other differences. 



Sp. 9. Lab. Romandii, Shuck. Length 4| lines. 



Expansion of the wings 7f lines. 

 Rufo-testacens, subptibescem : vertice badio, stigmate alarum brunneo-fusco 

 et pcdunculo abdominis quadrato convexo. 

 Reddish testaceous, subpubescent. Head having the vertex dark casta- 

 neous, on which the ocelli are in a curve and very large, the posterior 

 pair placed rather laterally and near the margin of the eyes; the facial 

 carinae small and rounding ofF to the sides of the anterior ocellus: an- 

 tennae moderately long, the scape very short, the flagellum not thickest 

 at the base: mandibles short and slender, leaving but a small narrow 

 space between them and the clypeus. 

 Thorax slightly gibbous in front; the scutellum not gibbous, rather flattened 

 above : metathorax rounded : superior wings with their nervures very 

 slender and brown, the stigma dark brown : the marginal cell lanceo- 

 late, larger than either of the two first submarginals, and slightly 

 acuminated beyond the apex of the second, which is less than the first, 

 from which it is separated by a nearly straight transverso-cubital ner- 

 vure ; the recurrent nervure inserted in the centre of the second sub- 

 marginal cell, and the cubital nervure thickened merely at the junc- 

 tion : legs short and slender. 

 Abdomen with the base of the intermediate segments constricted, the ter- 

 minal ones slightly compressed; the peduncle quadrate, slightly con- 

 vex, narrower than the second segment, which is also a little narrower 

 than the third ; the two last segments slightly laterally compressed, 

 and the apex of the terminal one very much compressed and fissile : 

 the sexual organ protruding as usual. In my own collection. 



This species was also captured by Mr. Swainson in the Brazils. 

 I have dedicated it, as a small tribute of respect, to Mons. de Ro- 

 mand, an ardent lover of the Hymenoptera, whose rich collection 

 would, I expect, yield other species had I the opportunity of exa- 

 mining it. The present is singularly distinguished by the form of 

 the peduncle, the compression of the segments, and the proportionate 

 differences between the second and third : its small mandibles are 

 also of a very peculiar character. 



? Sp. 10. Lab. mediatus, Fab. 



Niger ihorace arcu antico ci?iereo, abdomine rufo : petiolo anoque nigris. 

 Dorylus mediatus, Fab. Sys. Piez. 428. 3. 

 Habitat in America meridionali, Dom. Smidt. Mus. Dom« de Sehestedt. 



