128 AMERICAN HYMENOPTERA. 



prove to be synonymous with A. atriventris. It certainly 

 resembles this species in structure and color, but as Dr. 

 Ashmead placed it in the Genus Thyreodon instead of Athy- 

 reodon, it must be considered as possessing the small ocelli 

 characteristic of Thyreodon. 



Distribution. — Isle of Grenada (Balthazar). 



Thyreodon niaciilipennis Cress. 

 Thyreodon maculipenttis Cresson, Proc. Acad. Nat. Sci. Phila., 



p. 375, n. 2, 9 o^ 1873. 



DallaTorre, Cat. Hym., Ill, p. 185 1901. 



" " Szepligeti, Gen. Ins., Hym., 34me Fasc, 



p. 25, n. 13 1905. 



Black ; wings black, with a purplish reflection and a hyaline spot in 

 the discocubital and third discoidal cells. 



Length, 25-26 mm. ; wing, 17-18 mm. ; spread, 26-29 mm. 



Shining black, with a more or less distinct purplish reflection ; clothed 

 with fine short pubescence; -ocelli flavous, medium sized, with a me- 

 dian keel running from the anterior to or a little below the bases of 

 the antennae; eyes emarginate, medium sized ; clypeal foveae distinct; 



Thorax finely pubescent ; mesonotum with parapsidal furrows weak . 

 pleuraj and pectus smooth and polished; metathorax flat behind, with 

 a median longitudinal furrow and numerous arcuate carinae originat- 

 ing about the insertion of the abdomen, 



Wings violaceous black, the anterior pair with a hyaline spot in the 

 discocubital and third discoidal cells; nervulus antefurcal to interstitial; 

 nervellus broken above the middle. 



Legs and abdomen shining black. 



In describing this species I have compared the cotypes 

 with the original description. The antennae are missing. 



Cotypes. — Two 9 's and one cf. No. 70, Mexico, Ameri- 

 can Entomological Society. 



This species is closely related to T. morio transitionalis. 

 T. maculipemns may be separated by the violaceous reflec- 

 tion of the body and wings, which indicates that it is related 

 to and may be a subspecies of T. cyaneus or grandis with 

 similar variation from the species to that of transitionalis 

 from morio. The antennae of all the cotypes are, however, 

 missing, so that I am unable to decide this question. 



Distribution. — This species has been reported from Cor- 

 doba and Orizaba, Mexico, and probably ranges into Central 

 America. 



