HYMENOPTERA. 83 



(lomen of a silky texture, thinly covered with a short indistinct 

 pale pubescence ; beneath rufo-testaceous, tinged with green. 

 Hab. North America. (E. Doubleday, Esq.) 



Genus 17. OXYSTOGLOSSA, n. g. 



F. Smith's MSS. (DetaUs, Plate III.)," 



The eyes emarginate or subreniform ; thorax globose ; supe- 

 rior wings having one marginal and three submarginal cells, the 

 first submarginal cell as long as the second and third, the first 

 recurrent nervure uniting with the second transverse cubital ner- 

 vure. Mentum elongate, one-fifth shorter than the labium, para- 

 glossse short and obtuse at their apex; labium very long and 

 spiral, pointed at the apex ; labial palpi four-jointed, first joint 

 about the length of the two following, the apical joint clavate, 

 obtuse at the apex. Maxillse elongate, the terminal lobe about 

 one-fourth of its entire length. Maxillary palpi six-jointed, 

 terminal joint obtuse : — other characters as in the genus Augo- 

 chlora. 



1. OxYSTOGLOSSA DECORATA, n. S. B.M. 



Female. Length 2^ lines. — Head and thorax green, very finely 

 and closely punctiu-ed; clypeus very convex, much produced, 

 truncate and rugose towards the apex. Thorax closely and finely 

 punctured ; base of the metathorax not enclosed, transversely 

 roughened in the middle and obliquely striated on each side, be- 

 yond which is a smooth shining space ; wings subhyahne, iri- 

 descent, nervures testaceous ; legs testaceous, coxae tinged with 

 blue. Abdomen bright violet, margins of the segments slightly 

 piceous, beneath rufo-testaceous. 

 Hab. Jamaica. 



Genus 18. MEGALOPTA, n. g. 



F. Smith's MSS. (Details, Plate III.) 



Head as wide as the thorax, eyes emarginate, ocelli very large, 

 placed in a triangle on the vertex, the posterior pair on a line 

 with the vertex of the eyes ; the basal joint of the antennse more 

 than one-third of the entire length, or as long as the seven basal 

 joints of the flagellum ; tongue elongate, the apex acute, about 

 one-third longer than the mentum ; labial palpi four-jointed, the 

 basal joint as long as the two following, the apical joint cylin(h-ic 

 and acute at the apex ; the paraglossa; lanceolate, about the same 

 length as the labial palpi. Maxillary palpi six-jointed, nearly 

 one-thu-d longer than the apical lobe of the maxilhe. Labrum 



