383] LARVAE OF THE TENTHREDINOIDEA—YUASA 65 



GENERA OF CIMBICINAE 



1(4) Body in general whitish, without minute colored spots 2. 



2(3) Dorsum of body with a black median stripe Cimbex Olivier. 



3(2) Dorsum of body without a black median stripe Trichiosoma Leach. 



4(1) Body in general not whitish, but with minute colored spots Abia Leach. 



Cimbex Olivier 



Larvae very large, distinctly robust, largest of all saw-fly larvae, 40-50 

 mm. in length; body whitish with a distinct dorso-mesal black line; labrum 

 distinctly asymmetrical, dextral portion larger than sinistral, median 

 cephalic or ventral emargination distinct and deep; body with distinct 

 minute warts or conical glandubae, cuticle microscopically verrucose; 

 spiracular glands semicircular; sericos of labium pear-shaped with its nar- 

 row neck directed dorsad or cephalad; lateral lobes small but prominent with 

 several conical tubercles; maxillary palpi, 2, 4, 3, 1; labial palpi, 1, 2; 

 antennae mound-like, wider than high 



Cimbex americana Leach. — Length, 50 mm.; head, 5 mm. wide; head 

 white, creamy, microscopically brownish verrucose; black median stripe on 

 dorsum extending from prothorax to the middle of eighth abdominal 

 segment; conical tubercles or glandubae on sublateral lobes larger than 

 elsewhere and 4-7 in number; larvae solitary; on willow, elm, poplar, 

 maple, alder, linden, etc.; Y-68, -8, -182, M-99. 



Trichiosoma Leach 



Larvae very large, somewhat slender, entirely white; labrum slightly 

 asymmetrical, right side larger than sinistral, median ventral emargina- 

 tion deep, but not reaching the median lobe; body not warty; glandu- 

 bae microscopic, stalked, arising from very low swellings; cuticle micro- 

 scopically verrucose; spiracular glands semicircular; sericos of labium 

 U-shaped, narrower on dorsal or cephalic end; lateral lobes not prominent, 

 without conical tubercles; maxillary palpi 2, 4, 3, 1; labial palpi, 1, 2; 

 antennae conical, longer than wide. 



Trichiosoma sp. — Length, 38 mm. ; width of head, 4 mm. ; head creamy 

 white, body whitish; solitary; on willow, poplar, alder, wild cherry; 

 M-78, -44. 



Abia Leach 



Larvae large, rather plump, greenish or grayish green with minute 

 yellowish or blackish spots; labrum symmetrical, median ventral emargi- 

 nation only slightly indicated, broad; body without warts or tubercles; 

 cuticle microscopically and densely spinulate; glandubae stalked and 

 minute, not arising from swellings; spiracular glands semicircular; sericos 

 of labium V-shaped, widest at dorsal or cephalic end; sublateral lobes 



