106 ILLINOIS BIOLOGICAL MONOGRAPHS [424 



6(13) Head brown to yellowish 7. 



7(12) Head dark brown 8. 



8(9) Head paler along epicranial arms; subanal appendages with first segment as long as 

 all the other segments taken together; all segments pale to light brown; length,25 mm. ; 

 width of head, 3 mm.; body robust, large; following parts dark brown: head except 

 along epicranial arms, prothoracic shields, thoracic surpedal lobe, coxae, sterna 

 between thoracic legs, cervical sclerites, markings on the tenth abdominal segment, 

 median suranal process, and antenae; ocellarae black; suranal process short and 

 erect; tenth abdominal tergum with a pair of lateral patches, not connected along 

 caudal margin; tenth abdominal sternum with a median brown patch, distinctly 

 rounded on cephalic margin; subanal appendages light brown, first segment equal 

 in length to other two taken together, segment 2 longer than 3; thoracic legs with 

 fifth segment as long as fourth, and third taken together; antennal formula: (2, 5), 

 3, 6, 1, (4, 7); cuticle distinctly reticulate, each area brownish; three specimens in 

 MacGillivray collection bearing label "Cephalaeia sp. No. 839? Maine." (The 

 identification is open to question, but, since these larvae are readily distinguished 

 from the larvae of Pamphilius and Neurotoma by the characters used in the table 

 here, they may be considered, tentatively at least, as representing the genus Cephal- 



eia.) Cefhalcia sp. 1. 



9(8) Head not paler along epicranial arms, but uniformly brownish 10. 



10(11) Head pitch-brown; body pinkish to reddish brown; on spruce; Packard-36 



Pamphiliid sp. 3. 



11(10) Head horny brown; body horny brown; subanal appendages with first segment 

 longer than other two taken together, third segment brown; on Pinus strobus; 

 Packard-84 Pamphiliid sp. 4. 



12(7) Head yellowish to brownish yellow; body pale brick-red or yellowish, each segment 

 with a large reddish spot on the spiracular line; subanal appendages with first segment 

 nearly equal in length to other two taken together; all segments blackish; on Pinus 

 strobus; Packard-85 Pamphiliid sp. 5. 



13(6) Head pale red, with a black spot on the front; body reddish olive-green with purplish 

 meso-dorsal line; on Austrian pine; closely related to Lyda campestris; Packard-82. 



Pamphiliid sp. 6. 



14(1) Subanal appendages with the second segment distinctly shorter than the third; head 

 variously colored, blackish to pale; tenth abdominal tergum either with or without 

 colored patches IS. 



15(18) Tenth abdominal tergum with a colored patch on each side, median triangular patch 

 between the cephalic ends of the lateral patches wanting; lateral patches connected 

 along the caudal margin of tergum; sternum with a large colord patch 16. 



16(17) Head blackish or dark brownish, in younger specimens pale brown; subanal append- 

 ages with first segment longer than other two segments taken together, third longer 

 than second, all segments brown, the third darker; cervical sclerites pale brown, 

 dorsal and lateral shields of pro thorax pale to light brown, patches on the ultimate 

 segment brownish; body with a pink dorsal line on the meson; antennae in mature 

 specimens with formula, (2, 3, 5), 1, 7, (4, 6) ; ocularium about one-third the diameter 

 of antennaria; ocellarae small, eccentric, near the mesal margin of ocularium; 

 mouth-parts brownish; length, 19 mm.; width of head, 1.9 mm.; on wild cherry; 

 G Neurotoma fasciata Norton. 



17(16) Head lighter in color, yellowish, sometimes brownish yellow; subanal appendages with 

 first segment nearly equal to other two taken together, all segments black; following 

 parts blackish: prothoracic shields, thoracic legs, markings on ultimate segment, 

 subanal appendages, ocularia, thoracic sterna; the black markings of tenth abdominal 



