138 INSECUTOR INSCm/E MENSTRUUS 



long lateral marginal pairs of scutellar bristles, and weak decussate apical 

 pair. 



Reproductive habit, probably leaf-larviposition of colored maggots. 



Type, Trichosaundersia lineata, new species. 



Trichosaundersia lineata, new species. 



Length of body, 1 to 13 mm. ; of wing, 1 to 12 mm. One female 

 and two males, Uruhuasi Bridge, San Gaban Canyon, about 6,500 feet, 

 February 15, 1910, on flowers of Baccharis sp. ; and one mzJe, Casa- 

 huiri, same canyon, about 4,500 feet, February 14, 1910, on flowers 

 of Mikania sp. 



Whole head and thoreix pale old-gold pollinose, the parafrontals and 

 thorax with dark background showing through. Frontailia and first two 

 antennal joints reddish-brown, third antennal joint and arista blackish. 

 Pile of parafrontals and thoracic scutum black, that of rest of head and 

 sides of thorax rust-yellow. Disk of thorax with four narrow vittae of 

 usual pattern. Scutellum brownish rust-yellow, its pile black. Abdomen 

 deep yellow-red; an irregular median vitta of black, subinterrupted at 

 segmental sutures, usually narrowest on and segment, widest on front bor- 

 der of first segment, sometimes widest on anal segment. Pile of abdomen 

 deep rust-yellow, extending on venter, longest on posterior portions of 

 abdomen. Legs practically concolorous with scutellum, hardly as deeply 

 colored as abdomen. Wings wholly light fuscous, faintly tawny on 

 extreme base ; both scales of tegulae of a rich brownish rust-yellow, prac- 

 tically matching scutellum, rarely the hind scale subfuscous. 



Type, female, Uruhuasi. 



The present specimens furnish an excellent illustration of chaetotaxic 

 variation in the same form. The t)T)e specimen shows one postacrosti- 

 chal bristle on each side, this being the posterior one ; three postsutureJs, 

 and three stemopleurals ; two transverse discal rows of spines on scutel- 

 lum. The two males from Uruhuasi agree in having only two stemo- 

 pleurals, no postacrostichals, and only one transverse disceJ row of scutellar 

 spines ; but one has three postsuturals on each side, while the other has 

 only two on the left side, the middle one bemg absent. The male from 

 Casahuiri has three stemopleurals, three postsuturals, and three postacro- 

 stichaJs on each side, with two transverse discal rows of scutellar spines. 



Saundersiops, new genus. 



Allied to Cr^ptopalpus (syn. Saundersia) and Epalpus, but may be 



