345 



ones composing the transverse series on abdominal segments ; apical 

 segment with a conspicuous fringe of long soft hairs; respiratory 

 chamber preapical, rather wide centrally. 



Described from a specimen obtained in woods at Urbana, 111., 

 April 30, 1887 (C. M. Weed). 



This specimen differs so strikingly from any previously described 

 stratiomyiid that I do not feel justified in suggesting its location in 

 Hie family. 



Genus incertus 2 



Larva. — Length, 12 mm. Yellowish brown. 



Head very similar to that of Hermetia, the hairs on anterior por- 

 tion and the antennae short. Body of a more uniform width than in 

 Hermetia, not broadened apically. Thoracic segments with 2 long 

 and 2 or 4 short bristles in a nearly straight transverse row on dorsum, 

 and a group of 2 to 4 bristles on a common base on each side of venter. 

 Abdominal segments except apical one each with 4 rather weak bristles 

 close to posterior margin and 2 very long and strong ones near anteri- 

 or margin ; as shown in Figure 8, Plate XLIX ; ventrally, the series of 

 6 bristles nearly straight on each segment and the median two weaker 

 than the others ; lateral bristles and dorsal armature of apical segment 

 as in above figure ; venter of apical segment with 4 bristles on a dis- 

 tinct ridge proximad of anterior extremity of anal opening, the latter 

 fringed with short upright scales ; a series of 4 long bristles distad of 

 posterior extremity of anal opening. 



Described from a specimen obtained by C. A. Hart in the nest of 

 a cactus rat at Brownsville, Texas, December i, 1910. 



Genus incertus 3 



Larva. — Length, 4.5 mm. Yellowish testaceous. 



Head long, tapering anteriorly; antennae -short; maxillae fringed 

 anteriorly and rather conspicuous ; most of the surface bristles taper- 

 ing, the one above posterior margin of eye slightly clavate. Body 

 parallel-sided, the surface shagreened and covered with minute scales, 

 each segmental incision marked by a double series of small black dots, 

 and several similar dots on each segment laterally. First thoracic seg- 

 ment with the usual 2 transverse series of bristles on dorsum, the 

 others with a single series of 6 each which are, like those of the 

 abdomen, distinctly clavate ; ventral surface of each segment with 6 

 slightly clavate bristles in almost straight transverse series. Abdomi- 

 nal segments with a single clavate bristle on each lateral margin, 6 



