NO. 1361. REVISION OF AMERICAN 8IPH0NAPTERA— BAKER. 419 



smaller ones, the rowextendiiio- iii)ward and l)aokward. Hind maroin 

 of head with about eiohtecn bristles, one at caeh lower anolc, aiul one 

 above this within the low'er angle, large and long. Mouth parts large 

 and long, the labijil ]ialpi slighth' exeeeding anterior trochanters. 



Pronotuin with a transverse row of about twenty small bristles near 

 hind margin, and on hind margin a ctenidium of about thirty stout 

 spines. Meso- and metanotum each with a row of al)out eighteen 

 larger bristles posteriori}", and anterior to this three more or less 

 clearh' delined rows of minute bristles. Metathoracic epiphysis with 

 two bristles on the posterior margin, in front of which is a row of 

 about six, and still in front of the latter a row of about three bristles. 

 First alidominal tergite with two short teeth on either side, second 

 with three, and third with two on either side. Al)d()minal tergites 

 each with a transverse row of about twenty stronger l)ristles and an 

 anterior row of fewer and far smaller bristles. Antepygidial bristles 

 four on each side, the two middle of each group longest, but not sur- 

 passing the pygidium. Sometimes an extra bristle ma}" occur in one 

 or both groups. Between the two groups of antep3"gidial bristles, the 

 seventh segment is slightly, medially, angularly produced caudad. 

 Abdominal sternites each with one row of stout bristles (of about 

 twenty-four bristles on each middle sternite), which curves cephalad 

 laterally, and in front of this two very irregular rows of smaller and 

 far fewer bristles. 



The end of the abdomen is clothed with rather numerous small 

 bristles, two stouter ones occurring on either side beneath the P3''gid- 

 ium. The style is small, twice longer than broad, almost perfectly 

 cylindrical, and with two bristles at the tip. Substylar flap small, 

 with several long bristles at tip and a nuni))er of shorter stouter ones 

 on lower margin. Tenth tergite wnth numerous weak bristles, and 

 hind margin of eighth segment below with numerous bristles. 



Hind coxa without minute teeth inside. Hind femur with about 

 two irregular rows of man}' small bristles on the side. The tibial 

 spines are similar to those of others of the genus, but there are a 

 greater number of bristles on the side of the tibia than occurs in other 

 species. The tarsal joints are not more slender than usual. The first 

 hind tarsal joint with six groups of spines on either margin. The 

 spines on the apex of the second hind tarsal joint shorter than the 

 third joint. First pair of spines on the last tarsal joint somewhat dis- 

 located inward and incurved, though not projecting straight distad. 

 licngths of hind tarsal joints in the i)i"oportions 25-13.5-8.5-5-9.5. 



Length, 5.75 mm. Color, clear ]>rown. 



Male: Head tiattened above in the usual manner. The antennal 

 groove reaches the upper margin of the head. The tirst ab(U)niiiial 

 tergite has three teeth on either side of hind margin, the outer on each 

 side quite long; the second tergite has four or live of about e(iual 

 lengtli on eithi i' side; th<^ third has thr«^e on either side and the fourth 



