74 ILLINOIS BIOLOGICAL MONOGRAPHS (392 



segment distinctly and uniformly olivaceous-gray; third abdominal segment with 

 following setal map: 5-6, 5, 5, 1-2, 3, 6, 6, 10, 15, 8-9; maxillary palpi, 2, 3, (4, 1); 

 in younger specimens black spots on head larger and olivaceous shade on dorsum of 

 body restricted to cephalic segments; length, 16 mm.; width of head, 1.6 mm.; 

 on Prunus virginicus; Y-138-3. (This species resembles P. solitaris according to Dyar's 

 description but the latter feeds on Alnus, Prlophorus sp. 1. 



Cladius Rossi 



Larvae rather small; length less than 15 mm.; body slightly flattened, 

 greenish or yellowish green; never with spots or shaded on dorsal half; annu- 

 let 1 with a transverse row of several setae, annulet 2 with two warts bearing 

 5-6 setae, annulet 3 with three warts, dorsal two bearing 6-7 setae, ventral 

 with 10 setae; postsupraspiracular tubercles with 5-6 setae; subspiracular 

 lobe with 14-17 setae, surpedal lobe with 10 setae; setae usually straight, 

 usually of two lengths, longer ones less than half the height of head; setae 

 on annulet 1 among the shortest. 



Cladius pectinicornis Fourcroy. — Length, 12-14 mm.; head pale brown- 

 ish or yellowish, microscopically verrucose, with brownish spots; front 

 touched with light brown; body hairy, uniformly greenish or greenish 

 yellow; third abdominal segment with the following setal map: 5-6, 5, 6, 

 1, 5-6, 6, 7, 10, 14-17, 10; maxillary palpi, (2, 3), 1, 4; on Rosa; Y-3, M-244. 



Subfamily Nematinae 



Larvae (Fig. 18) small to moderately large; body cylindrical, slender, or 

 abdomen increasing in diameter; segmentation and annulation usually 

 distinct; third abdominal segment with 4, 5 or 6 annulets, annulets 1, 2, 3, 

 or 1, 2, 4, or more usually 2 and 4, setiferous; larvapods present on abdom- 

 inal segments 2-7 and 10, setiferous or sometimes glabrous; ventral glands 

 present on the meson of abdominal segments 1-7; thoracic legs normal in 

 form; body uniformly greenish or darker colored, striped or spotted, 

 tuberculate, setiferous or smooth; antennae with four segments, conical, 

 subconical, limpet-shaped, or flattened; antennal segments sometimes 

 incomplete or in part fused together; tenth abdominal tergum with or 

 without a pair of caudal protuberances; glandubae sometimes distinct, 

 conspicuous, and stalked; spiracles winged or not; larvae free leaf -feeders, 

 gall-makers, and leaf-rollers. 



The Nematinae is a large subfamily of several genera and numerous 

 species and is characterized by the coalescence of the cells 2d A and 3d A 

 due to the atrophy of the free part of the 3d anal vein. The absence of the 

 radial cross-vein and the cell 1st 2d A distinguishes the adults of this 

 subfamily from those of the Hoplocampinae and Cladiinae respectively. 

 Rohwer (1912), who would unite the Nematinae, Hoplocampinae, and 

 three genera of the Cladiinae in one subfamily, Nematinae, states that the 



