DIPTERA. 165 
SYNECHES, n. g. 
Antennis articuli breves ; 3us 20 multo latior vix longior ; seta capite 
vix brevior articulis 1o ad 3um triplo longior: ale costa incisa ; areole 
undecim, duo marginales,,una submarginalis, una apicalis, duo posteriores, 
una inferior, tres basales, una discoidalis, 
Joints of the feelers short ; third joint nearly round, much broader but 
hardly longer than the second joint; bristle very slender, about thrice the 
length of all the preceding joints, nearly as long as the head: chest gib- 
bous: fore border of the wing slightly notched towards the brand: two 
marginal areolets, one submarginal, one apical, two posterior, one inferior, 
three basal, and one discoidal. 
SynEcHEs simpLex, Mas, Plate 5, fig. 7. 
Fusca, thorace vittis indistinctis fulvis ornato, abdomine niyro, antennis 
pedibusque fulvis, alis cinereis fusco flavoque variis. 
Body dark brown, clothed with black hairs: eyes red, meeting above ; 
facets large: mouth and feelers tawny ; bristle of the fecler black: chest 
adorned with tawny stripes which are nearly confluent: abdomen linear, 
rather flat, black, longer and much narrower than the chest; tip dark 
tawny, shining: legs tawny ; thighs and fore-shanks partly pitehy : wings 
pale gray, brownish on the borders of the cross-veins and beneath the 
brand, which is dark brown; the wing is yellow on each side of the latter, 
and there is a dark brown spot beyond it; wing-ribs and veins brown; 
poisers large, tawny. Length of the body 14 line; of the wings 3 lines. 
United States. 
Fam. BOMBYLIARII, Meigen. 
Genus ANTHRAX, Fabr. 
Is here divided into the following groups, of which several lesser sec- 
tions may be formed. . 
Group 1. Exoprosora, Macquart. 
Four submarginal areolets. Feelers like fig. 4, Pl. 17, Meig. 
Ex.—A. stymphalis, Phlegethon, Harpia, umbrifer, Orcus, Erebus, 
Cerberus, Proserpina, rufescens, erythrocephala, dives, ferrea, Tantalus, 
funesta, Sphinx, Lucifer, purpuraria, pulchra. 
Z 
