106 WALKER ON DIPTERA OF ABU ISLANDS. 



lato, alls obscure cinereis apud costam nigricantlbus, alulis testaceo- 

 cinereis. 

 Female. Black, slightly covered with cinereous tomentum. Head white 

 behind ; thorax with four slender black stripes ; abdomen distinctly 

 tessellated with four rows of cinereous reflecting spots ; wings very 

 dark grey, blackish towards the costa, praebrachial vein forming a 

 somewhat rounded and very slightly obtuse angle at its flexure, hardly 

 curved inward from thence to its tip, discal transverse vein slightly 

 undulating, parted by less than half its length from the body, and by 

 more than half its length from the flexure of the prsebrachial ; alulae 

 cinereous, with a testaceous tinge. Length of the body 3-^ lines ; of 

 the wings 7 lines. 



104. MuscA PATIENS, n. s. Fcem. Nigra, cinereo-tomentosa, frontali- 

 bus antennisque piceis, thorace vittis quatuor tenuissimis nigris, 

 abdomine tessellato, alis cinereis. 



Female. Black, with cinereous tomentum. Head whitish behind, fron- 

 talia piceous, linear ; antcnnse piceous ; thorax with four very slender 

 black stripes ; abdomen tessellated ; wings grey, veins black, prae- 

 brachial vein forming an obtuse and somewhat rounded angle at its 

 flexure, from whence it is hardly curved inward to its tip, discal 

 transverse vein undulating, parted by less than half its length from 

 the border, and by more than half its length from the flexure of the 

 praebrachial ; alulae slightly cinereous, with testaceous borders. Length 

 of the body 3 lines ; of the wings 6 lines. 



105. MuscA ERiSTALoiDES, n. s. (gcuus Pollcnia? Desv.) Mas et 

 Foem. Aureo tomentosa, crassa, subtus testacea, capite antico albo 

 fjontalibus antice rufis, antennis piceis basi rufis, thorace vittis tribus 

 abbreviatis fulvis, scutello cyaneo, abdomine cyaneo basi fasciisque 

 duabus albis, pedibus fulvis, tibiis tarsisque nigris, alis cinereis 

 apud costam fuscescentibus. Var. mas. Minor, thorace vittis tribus 

 nigris. 



Male and Female. Body thick; head white; frontalia of the female 

 piceous, linear, red in front ; epistoma prominent ; proboscis long ; 

 palpi whitish; antennae piceous, red at the base; thorax with gilded 

 tomentum, and with three tawny bands which are abbreviated hind- 

 ward, scutellum blue ; pectus testaceous ; abdomen blue, white at 

 the base and with two white bands on the 3rd and 4th segments, 

 1st segment with a transverse blue spot on each side; legs taw^ny, 

 tibiae and tarsi black ; wings grey, blackish along the exterior part of 

 the costa, praebrachial vein forming a right but rounded angle at its 

 flexure, near which it is curved inward and is thence straight to its 

 tip, discal transverse vein slightly undulating, parted by a little more 

 than half its length from the border, and by much more than half its 

 length from the flexure of the praebrachial ; alulae testaceous. Var. 

 Male. Smaller ; thorax with three black stripes ; abdomen with only 



