10 misc. publication 511, u. s. deft. of agriculture 



Thylodrtinae 



Represented by the single species Thylodrias contractus Mots. 



Body oblong ; dorsally reddish brown and strongly sclerotized, ventrally white 

 and membranous ; densely covered with short, subequal, spinulate setae ; thoracic 

 tergites and abdominal tergites 1 to 7 (fig. 3, K) each with 2 transverse rows of 

 setae along posterior margin, the posterior row composed of slender, pale, pointed 

 setae, the other of darker, thick, clavate setae, the latter row forming a pro- 

 nounced comblike series and somewhat covering the first row ; tergites anteriorly 

 with numerous slender, pale, recumbent setae arising at random and directed 

 mesally; tergites laterally, except pronotum, rounded, bearing on each lateral 

 margin a tuft of stout, dark, pointed setae ; lateral and anterior marginal pubes- 

 cence of pronotum very dense ; eighth and ninth tergites similar to others but 

 with dense transverse series of stout, pointed setae along posterior margins; 

 tenth abdominal segment small, entirely membranous. Spiracles in membrane, 

 small and inconspicuous. Legs long and slender. Head reddish brown, setifer- 

 ous; 3 ocelli on each side; antenna (fig. 2, N) short, accessory papillae nearly as 

 long as third segment, setae of first segment numerous, extending beyond and 

 concealing terminal segments. Labrum setiferous. Labro-epipharyngeal mar- 

 gin (fig. 4, D) with setae of middle series broad, shorter than setae of lateral 

 series, sometimes distally emarginate. Epipharynx (fig. 4, D) with proximal 

 sensory area composed of a transverse series of 4 large papillae and a slightly 

 more proximal transverse series of about 20 to 24 sensory cups ; epipharyngeal 

 rods pigmented, curved and diverging lateroposteriorly. Mandible (fig. 2, E and 

 F) distally piceous and rounded, distinctly narrower than yellowish-brown basal 

 half, inner dorsal cutting edge rounded, retinaculum and basal setal brush absent ; 

 maxillary palpus (fig. 3, D) 4-segmented, apical segment slightly longer than 

 the other 3 combined ; last segment of labial palpus longer than first ; gula and 

 submentum not fused. 



Lepesme and Paulian (7) were not able to study larval specimens of 

 Thylodrias contractus and had to rely for characters upon their inter- 

 pretations of the illustrations of this species presented by Bovin^ and 

 Craighead (1). They interpreted the antenna to be biarticulate and 

 the head to possess 5 ocelli on each side. Boving and Craighead (1) 

 illustrate the maxillary palpus of this species as being 3-segmented and 

 do not indicate the posterior sensory papillae or sensory cups of the 

 epipharynx. They also represent the anterior area of each tergite, 

 except the pronotum, as bearing a single transverse series of fine setae. 



Anthreninae 



Represented in North America by the genera Perhnegatoma, Trogo- 

 derrna, Acolpus, Thaumaglossa, Cryptorhopalum, and Anthrenus. 



Body fusiform, oval, or suboblong ; dorsally sclerotized and pigmented, ventrally 

 less so; clothed with long or short spinulate setae and hastisetae (fig. 3, F) ; 

 last abdominal segments with hastisetal tufts; ninth abdominal segment with 

 caudal brush composed usually of many long setae but sometimes of fewer some- 

 what shorter and curved, setae ; tenth abdominal segment small, white, mem- 

 branous. Six ocelli on each side of head. Epipbarynx (figs. 4, E and F; 5, A- 

 F) with distal sensory papillae, normally 6 ; a medium pair of sensory cups ; a 

 proximal transverse series of sensory cups; a pair of epipharyngeal rods. Man- 

 dible (fig. 2, G) distally rounded and piceous, basally yellowish brown, retinac- 

 ulum present or absent, basal setal brush absent; maxillary palpus (fig. 3, E) 

 3-segmented. 



MEGATOMINI 



Body elongate, fusiform, not compact, typically with greatest width through 

 the thorax, hastisetae arising from tergites, tergites never curved about bases of 

 hastisetal tufts. 



