Hymeno'ptera etc. from Rodriguez. 449 



Sphegidae. 

 Pelopmus convexus. 



Male. Length 5-6| lines. Head and thorax blue ; abdomen 

 and legs deep blue. The face with silveiy-white pubescence ; 

 a thin griseous pubescence on the cheeks. Thorax — the meso- 

 thorax evenly punctured and convex, with a central impressed 

 longitudinal line, without any trace of longitudinal channels ; 

 rather strongly, but not very closely, punctured, on the disk 

 a few transverse irregular carinee ; wings subhyaline, with their 

 apical margins clouded ; the thorax has a thin, sparing, griseous 

 pubescence ; the apex of the raetathorax with bright silvery 

 pubescence ; the tibiaj have the calcaria black. 

 , (Coll. by Slater.) 



Ophionidse. 



Pnniscus perforator. 



Female. Length 6 lines. Rufo-ferruginous ; the face and 

 scape of the antennse in front yellow ; the space between the 

 ocelli black. Thorax — the sides, the sutures on the meso- 

 thorax, and the scutellum paler than the disk ; wings hyaline 

 and iridescent ; the stigma and nervures rufous ; the legs and 

 abdomen rufous, the latter slightly fuscous at the apex. 



(Coll. by Slater.) 



This species is like P. melanopuSj Brulle ; but all its tarsi 

 are rufous, as well as the nervures of the wings ; in P. mela- 

 nojms they are black. Brulle's species is from Mauritius. 



Muscidae. 



Pollenia basalts. 



Length 4 lines. Dark blue, with shades of green on the 

 disk of the thorax ; the face and cheeks luteous, and clothed 

 with short, dense, yellow pubescence ; at the end of the fa- 

 cialia a black bristle on each side ; antenna3 in deep facial 

 grooves, slightly yellow at the base, third joint long, arista 

 longly plumose ; palpi luteous, with black bristles ; frons black 

 and more than a quarter the width of the head ; wings hya- 

 line, with their base fuscous ; the transverse vein at the end 

 of the wing nearly rectangular below and much curved above, 

 leaving the cell open ; the lower transverse vein very oblique. 

 Abdomen with a little short luteous pubescence at the apex 

 and also beneath ; alulfe dirty white. 



(Coll. by Slater.) 

 Ann. (b Mag. N. Hist. Ser. 4. Vol. xvii. 30 



