88 INSECUTOR INSCITI^ MENSTRUUS 



one-half eye-height. ParaJacials narrow and hairy. Proboscis nearly 

 one and one-half times head-height. No sign of palpi, not even bristles. 



Three stemopleural bristles ; only one postsutural, being the next to 

 last ; no acrosticheJ bristles either before or behind suture. Scutellum 

 with a weak anterior lateral and a long posterior lateral bristle ; two sub- 

 marginal spinelike macrochaetae on each side, the anterior pair shorter 

 and rather subdiscal, the posterior pair more median and with a weak 

 divergent pair between them ; a transverse row of eight weak spinelike 

 macrochaetae near front margin. Female abdomen elongate-subquadrate, 

 rather flattened than arched, swollen ; anal segment well v^dened and 

 gently but conspicuously emarginate behind, not quite as long as second 

 and third segments together, its greatest length but little less than its basal 

 width, its apical v^adth a little less than its length on median line. Second 

 and third segments with spinelike macrochaetae of varying strength along 

 entire hind margin above, those of third segment extending in shorter 

 ones on venter ; first segment with a lateral bunch of marginal macrochae- 

 tae ; second segment with a well-spread median bunch of about eight 

 pairs of short spinelike macrochaetae on disk ; third segment with two or 

 three pairs of similar discal ; anal segment sparsely set with spinelike ma- 

 crochaetae on a little more than its posterior half, extending on venter in 

 shorter ones. Ventral plates of first to fourth segments with bunches of 

 spines gradually decreasing in length from those of first segment, which 

 are longest and strongest. Front tarsi of female very slightly widened ; 

 claws shorter than last tarsal joint. Apical cell well narrowed terminally, 

 fourth vein with the very faintest stump at origin of apical cross vein. 



Reproductive habit, almost certainly larviposition of colored maggots. 



Type, Eucorpulentosoma simile, new species. 



Eucorpulentosoma simile, new species. 



Length of body, 8 mm.; same to end of spines, 9.25 mm.; of wing, 

 8.75 mm. One femeJe, Uruhuasi Bridge, San Gaban Canyon, about 

 6,500 feet, February 3, 1910, on flowers of Baccharis sp. 



In coloration this species approaches Corpulentosoma cornutum so 

 closely that it may best be described by comparison v^dth that species, the 

 difference being as follows : The occiput is silvery-white below like face ; 

 cheek-grooves deeply smoky ; upper part of occiput dark, with silvery 

 bloom. Pleurae thinly silvery-white, their ground color a little paler than 

 that of legs and abdomen. Thoracic scutum with the four heavy and 



