52 ILLINOIS BIOLOGICAL MONOGRAPHS [370 



mouth-parts normal in form, well developed, palpi large; mandibles with 

 two setae; clypeus with three, sometimes four, setae on each side, rarely 

 with two; stipes of maxillae with triangular cephalo-ventral projection; 

 glandubae minute, stalked; spiracles not distinctly winged; larvapods 

 setiferous, with about ten setae, rarely glabrous. 



The Selandriinae includes a limited number of genera. On the basis of 

 the venation this subfamily is placed next to the Emphytinae where 

 practically all systematists have placed it. Rohwer's conception of this 

 subfamily is somewhat different from that of MacGillivray and therefore 

 he differs from the latter in the disposition of some of the genera. For 

 example, Hemitaxonus is assigned to the tribe Selandriini while Mac- 

 Gillivray placed it, together with Epitaxonus, in the Emphytinae. It may 

 be said that the larvae of these two genera are very closely related to the 

 Selandriinae and differ from all other Emphytinae in the typical number 

 of annulets. 



GENERA OF SELANDRIINAE 



1(4) Thoracic legs with tibia normal in form, never greatly reduced, usually subequal 

 in length to femur; larvapods setiferous; clypeus with three or four setae on each 



side 2. 



2(3) Tenth abdominal tergum with brown spots; larvapods usually with ten or more 

 setae; clypeus usually with three and often four setae on each side; labium deep 

 brown, with four to six setae on each side; glandubae slightly longer than one-half the 

 length of adjacent setae; spiracles not winged; larger larvae; length more than 

 24 mm Tkrinax Konow. 



3(2) Tenth abdominal tergum not marked with brown spots; larvapods usually with less 

 than ten setae; clypeus with three, rarely with four, setae on each side; labium pale 

 brown or whitish with three to six setae; glandubae usually subequal in length to 

 adjacent setae; spiracles faintly winged; smaller larvae; length less than 24 mm. 



Strongylogaster Dahlbom. 



4(1) Thoracic legs with tibia reduced, very much smaller than femur; larvapods glabrous; 

 clypeus with two setae on each side Sdandria Leach. 



Thrinax Konow 



Larvae comparatively large, long, length more than 24 mm.; body 

 slender, finely annulate, uniformly greenish; head and tenth abdominal 

 tergum with brown markings; thoracic legs normal, tibia and femur 

 cylindrical, tapering caudad, subequal in length; larvapods with about 

 ten setae, distributed as follows: 4-5 on cephalic and lateral aspects and 

 one on caudal; clypeus usually with three and often with four setae on each 

 side; labrum with four to six setae on each side, deep brown, without 

 median longitudinal depression; glandubae small, very short, slightly longer 

 than one-half the length of adjacent setae; spiracles not winged; maxillary 

 palpi with segments 2 and 4 subequal in length; labial palpi with segment 4 

 longer than segment 3 ; ninth abdominal tergum with six annulets, annulets 

 1, 3, and 5 setiferous, annulet 6 a little shorter than the second. 



