96 DIPTERA OF NORTH AMERICA. [PART IV. 



the middle of the stigma, and hence nearer the tip of the first 

 longitudinal vein than in the preceding species. 



Hab. Illinois (Kennicott) ; a single female. The feet are 

 wanting and the thorax is somewhat injured by the pin ; but the 

 species can never be mistaken for any other. 



The following species from California has not been included in 

 the dichotomical table on page 87 : — 



10. L.. californica 0. S. % . — Thoracis vittis quatuor fuscis ; alis 

 fuscescentibus, pallide fenestratis, margine antioo maculis quatuor fuscis. 



Thorax with four brown stripes; wings brownish, with some subhyaline 

 spaces ; anterior margin with four brown spots. Long. corp. 0.7 — 0.8. 



Syn. Limnobia californica 0. Sacken, Proc. Ac. Nat. Sc. Phil. 1861, p. 288. 



Front and vertex brown ; under side of the head yellow ; 

 rostrum, palpi, and antennae brown ; two basal joints of the latter 

 yellow. Thorax yellowish, mixed with brown ; the two inter- 

 mediate thoracic stripes are narrow, parallel ; at their anterior 

 end, they coalesce with the brown margin of the mesonotum, 

 which is broadest at the humeri ; pleurae, scutellum, and meta- 

 thorax more or less tinged with brownish ; basis and tip of the 

 halteres pale, the intermediate portion infuscated ; femora brown- 

 ish; a yellow band before the tip, which is black; tibiae ferrugi- 

 nous-brownish, brown at the tip ; tarsi ferruginous-brownish at 

 the basis, the remainder brown. Wings with a uniform brownish 

 tinge ; four large brown spots along the anterior margin ; the 

 first at the inner end of the first basal cell ; the second, somewhat 

 trapezoidal in shape, at the origin of the praefurca ; both do not 

 cross the first longitudinal vein, and do not, therefore, reach the 

 anterior margin ; the second is limited posteriorly by the fourth 

 longitudinal vein ; the third spot is double, consisting of an 

 oblique spot which begins at the margin, just beyond the tip of 

 the auxiliary vein and coalesces with a round spot at the inner 

 end of the submarginal cell ; the fourth spot is at the tip of the 

 first longitudinal vein ; it is semi-oval and is inclosed between 

 the costa and the second longitudinal vein; there are several 

 subhyaline spots on the surface of the wing ; a large angular one, 

 beginning about the middle of the -anal cell and reaching the 



