GYMNOPTERNUS. 85 



interior appendages of the hypopygium bear a few hairs before 

 the tip. 



Hab. Pennsylvania. (Osten-Sacken.) 



7. G. spectal»ilis Loew. £• — Tliorace violaceo, antennis nigris, coxis 

 nigrieantibus, pedibus flavis. 



Thorax violet, antennae black, coxse blackish, feet yellow. Long. corp. 

 0.17. Long. al. O.fr. 



Syn. Gymnopternus spectabilis Loew, Neue Beitr. VIII, 30, 6. 



Is among the largest North American species of this genus 

 known to me. Face and front with an almost silvery-white dust, 

 though upon the latter the dust is less thick. Antenna; altogether 

 black ; third joint short ; the arista is somewhat stout at the basis 

 and has a plainly perceptible pubescence. Cilia of the inferior 

 orbit black. The upper side of the thorax metallic violet, the scu- 

 tellum likewise ; the latter has some short hairs in the middle. 

 Abdomen blackish metallic green, bright. All the coxag up to the 

 extreme tip blackish. Feet yellow, tarsi from the tip of the first 

 joint infuscated ; the usual row of bristles upon the upper side of 

 the fore tibia? complete and distinct, though the single bristles arc 

 comparatively not long. Cilia of the tegulas black. Wings 

 tinged with gray-brown, towards the anterior margin a little 

 browner ; the third and fourth longitudinal veins perfectly parallel. 



Hab. New York. (Osten-Sacken.) 



Observation. — Had Mr. Wiedemann not stated the size of Do- 

 lichopus obscurus Say to be 1^ line, I would have most certainly 

 believed that my G. spectabilis is the D. obscurus of Mr. Say. 

 Nevertheless the statements of MM. Wiedemann and Say aboul 

 D. obscurus do not apply so closely to G. spectabilis as to waive 

 such an important difference and to consider both species as one 

 and the same. 



8. G. albiceps Loew. 9 • — Thorace violaceo, antennis rufis in apice 

 fuscis, coxis pedibusque flavis. 



Thorax violet, the red antennas brown at the tip ; cox33 and feet yellow. 

 Long. corp. 0.17. Long. al. 0.17. 



Syn. Gymnopternus albiceps Loew, IS'eue Beitr. VIII, 30, 7. 



Face very broad, mure bo than that of 0. spectabilie, snow- 

 white. Antennae dusky red; third joint small, rounded, dark 



