102 ILLINOIS BIOLOGICAL MONOGRAPHS [420 



protuberances; thoracic legs modified, prothoracic legs apparently four- 

 segmented, distal segment pad-like, tarsal claws wanting; mesothoracic 

 and metathoracic legs apparently three-segmented, distal segment pad- 

 like with a sharp claw on cephalic side; antennae apparently one-segmented, 

 segment large with several clear spots; antennaria ventrad or slightly 

 caudad of ocularium; spiracles winged; glandubae obsolete; in younger 

 specimens larvapods sometimes very indistinct; tubercles often indistinct; 

 leaf-miners. 



The Schizocerinae is represented in the Nearctic region by a single 

 genus, Schizocerus, and includes a limited number of species. Modern 

 systematists have always associated this subfamily with the Hylotominae, 

 the two being separated by the presence or absence of the free part of 

 Sc2 in the front wing. The larvae of this subfamily are unique in having 

 thoracic legs and maxillary and labial palpi modified by reduction in the 

 number of segments. 



ScmzocERUS Lepeletier 



Larvae small, length less than 15 mm., creamy- whitish; head small, 

 pale brown, higher than wide, sparsely and microscopically setiferous; 

 annulation 1, 2, 3; annulets above spiracular lines with tubercles, 2 on 

 annulet 1, four on annulet 2, and three on annulet 3, annulet 1 with a row 

 of tubercles on venter; a row of tubercles between larvapods and surpedal 

 area; subspiracular area not tuberculate or warty; tenth abdominal 

 tergum small, only slightly convex, tubercules almost obsolete, with 

 several stiff short setae on caudal margin; venter of ultimate segment 

 with distinct anal larvapods, subanal lobe with a pair of long and short 

 tubercles on each latero-caudal margin; maxillary palpi apparently three- 

 segmented, distal segment very minute, formula, 2, 1, 3; labial palpi 

 apparently two-segmented; mandibles as viewed from side narrow and 

 slender; totaglossa of labium large; spiracles winged, wings small, oblong; 

 spiracular line dividing the latus into two subequal dorso- ventral parts. 



Schizocerus zabriskiei Ashmead. — Head pale brownish-green, body 

 whitish; in younger specimens head brownish, body with minute tubercles 

 touched with brown; legs, and venter between legs brownish; tubercles 

 ventrad of surpedal area and dorsad of larvapods usually three in number 

 in mature larvae and two in younger larvae; mature specimen, length, 

 13 mm.; width of head, 1.3 mm.; on Portulaca; Y, G. 



Schizocerus sp. 1. — Larvae indistinguishable from the preceding species. 

 This species was collected at Muncie, 111., by Dr. Edna Mosher, who 

 bred adults. It is considered by Dr. MacGiUivray to be a new species. 



