158 INSECUTOR INSCITI/E MENSTRUUS 



clear yellow, excepting only a blackish median triangle on first segment 

 beneath scutellum ; anal segment wholly blackish, and thickly spinose 

 throughout. Third segment has a thickly-set continuous row of margined 

 macrochaetae ; but that of second segment is not continuous, being well 

 interrupted on sides. The proboscis extended is about equeJ to head- 

 height. No ocellar bristles. Third antennal joint hardly longer than second, 

 convex on front edge and rounded apically. Four sternopleural bristles. 

 The following formulae express the compeirative chaetotaxy of the five 

 species here referred to this genus, with reference to the four inner meso- 

 scutal rows. A stands for acrostichal (preacrostichal and postacrostichal), 

 and D for (outer) dorsocentral (presutural and postsutural). 



X. bicolor X. bipartitus X. gabanus X. semiflavus X. flavoscutellatus 



(Colorado) (Mexico) (Peru) (Bolivia) (Brazil) 



AD AD AD AD AD 



Before suture 23 33 33 34 33 



Behind suture 3-4 4 3-4 4 4 4 3 4 3 3-4 



Chromoepalpus, new genus. 



General characters of Epalpus. Description is from female only. 

 Front of femcJe at vertex about one and one-fourth times eye-width. 

 No ocellar bristles. Only one procHnate orbital bristle in female. Second 

 antennal joint moderately elongate ; third joint of femeJe convex on front 

 edge, about one and one-half times as long as second ; second aristal 

 joint short, no longer than broad. Parafacials wide, cheeks of female 

 more than one-half eye-height. Proboscis extended a little longer than 

 head-height, no palpal bristlets. Front tarsal joints of female hardly at 

 all widened. 



Two sternopleural bristles; three postsutural, the next to front one 

 wanting ; no acrostichal either before or behind suture. Scutellum with 

 only one lateral marginal pair of ordinary macrochaetae, set with five 

 pairs of straight spinelike macrochaetae on and near hind margin, leaving 

 most of disk bare. Abdomen short-oval, narrowly subtruncate at tip 

 which is faintly concave in outline from above. First segment with only 

 two lateral marginal macrochaetae ; second segment with five lateral 

 spinelike, three being marginal and two shorter ones submarginal or sub- 

 discal ; about ten macrochaetae closely placed on hind margin of second 

 segment in middle, leaving wide space between same and the lateral 

 ones, and a median discal bunch of twelve shorter ones more widely 

 spread along anterior margin of segment ; third segment with a marginal 



