in the Collection of W. W. Saunders, Esq. 153 



fulvo, pectore aurato, abdomine tnaculis duabus basalibus 

 lateralibus trigonis luteis, pedibus fulvis, femoribus flavis, 

 anticis nigro-notatis, alis subcinereis, apud costam fuscis, 

 halteribus flavis. 



Female. — Black ; head ferruginous, with pale gilded tomentum 

 about the eyes, white with a black shining mark on each side of 

 the peristoma ; thorax with three imperfect luteous stripes and as 

 many luteous bands ; scutellum tawny ; pectus gilded ; abdomen 

 with a triangular luteous spot on each side at the base ; fore 

 borders of the segments with testaceous tomentum ; legs tawny, 

 femora mostly pale yellow, fore femora with a black dot on each 

 at the base ; wings greyishj brown along the costa, veins black ; 

 halteres pale yellow. 



Length of the body 6 lines ; of the wings 11 lines. 



Valley of the Amazon. 



Helophilus aiiratus. 



Mas, — Niger, aureo-pubescens, abdomine aeneo, alis subcinereis, 

 apud costam nigris. 



Male. — Black, covered with gilded down, which is brightest on 

 the vertex ; abdomen aeneous ; wings greyish, brown in front, 

 veins black. 



Length of the body 4| lines ; of the wings 7 lines. 



Valley of the Amazon. 



Genus Merodon, Latr. 

 Merodon torpidus. 



Niger, capite antico-albo, antennis fulvis, abdomine fasciis inter- 

 ruptis cano-tomentosis, alis obscure cinereis. 



Black ; head white in front ; antennae tawny ; abdomen with 

 an interrupted band of hoary tomentum on the fore border of 

 each segment ; wings dark grey, veins black. 



Length of the body 6 lines ; of the wings 9 lines. 



Genus Syritta, St. Farg. et Serv. 

 Syritta transversa. 



Mas. — Nigra, capite aurato, antennis ferrugineis, thorace fasciis 

 duabus anterioribus transversis interruptis maculaque trans- 



