8 PROCEEDINGS OF THE NATIONAL MUSEUM vol.78 



marginal vein towards the basal posterior margin. There are numer- 

 ous departures from the typical wing and in such cases an effort has 

 been made to figure the wing or describe it in detail. The wings 

 may be hyaline, faintly infuscated or with a well marked infus- 

 cated pattern. 



Legs. — Aside from noting the length of the basitarsus relative to 

 the length of the tibial spur of the middle legs, and the length of 

 the basitarsus relative to the succeeding joints, no other leg charac- 

 ters have been used except in the case of G . zebratxis Howard which 

 is anomalous in having the hind coxae and femora greatly swollen. 

 The short tarsal joints of certain species aid in their recognition 

 but the great majority of Ooccophagus have the basitarsus of the 

 middle legs about as long as its succeeding three or four joints united 

 and the tibial spur slightly shorter than the basitarsus, 



Vestiture. — The vestiture furnishes a very convenient character 

 for the separation of the species into two groups. Those having the 

 scutellum about as densely setose as the mesoscutum are placed in 

 one group while those having the scutellum furnished with but three 

 pairs of bristles are placed in the other group. This division is not 

 a fundamental one, since some species of one group are structurally 

 similar to some of those of the other group. C. trifasciatus Compere 

 is intermediate between these two groups, for in addition to the three 

 pairs of bristles a varying number of small setae are scattered near 

 the anterior pair of bristles. A few species contain individuals 

 having two or three supernumerary setae in addition to the paired 

 bristles. The great majority of species of Coccojjhagus have the 

 mesoscutum densely setose, only a few of the small yellow species 

 having fewer setae on the mesoscutum. In all the species of Pros- 

 paJtelJa seen by me, the setae are few and arranged in longitudinal 

 rows, while in Ooccophagus the setae are more numerous and not ar- 

 ranged in four parallel rows. However, this character seems very 

 superficial and may not apply to all the species. Each axilla is us- 

 ually furnished with two setae or bristles. C. redini Girault has 

 the axillae as densely and conspicuously setose as the mesoscutum, 

 while C. tnariformis^ new species and C. malthusi Girault have, in 

 addition to the two large setae, some supernumerary setae that are 

 easily overlooked. An undescribed African species, known only 

 from a single individual in the Rust collection, has the axillae setose. 

 The size, arrangement, and abundance of the setae on the head, body 

 and legs are of taxonomic importance in some cases and can be con- 

 veniently used to distinguish certain species. 



Sculpture. — The character of the sculpture is best studied in 

 cleared balsam-mounted specimens. The sculpture as seen in a 

 cleared balsam-mounted specimen appears quite different from the 

 same sculpture seen in a tag-mounted specimen. The sculpture of 



