118 American Midland Naturalist Monograph No. 3 



tergite (IX-T); lobes of ninth tergite not developed, represented only by a few 

 setae. Tenth sternite (X-S) prominent, heavily sclerotized apically. Phallosome 

 (Ph) broadly pyriform, truncate at apex, closed dorsally beyond middle by a 

 membranous connection, open ventrally; each plate broad on basal half, nar- 

 rowed distally, with a small but distinct medial triangular projection turned 

 ventrally and laterally from the inner margin and with several short heavily 

 sclerotized subapical teeth directed dorsally. Claspette absent. Bast style (Bs) 

 conical, slightly curved, about three times as long as basal width, rounded at 

 apex, clothed with scales and long setae and with one or two large curved 

 spines arising from inner face near middle; basal lobe (B-L) conical, appressed 

 to basistyle, bearing a few large spines apically and numerous smaller setae 

 on sides; apical lobe absent. Dististyle (Ds) about three-fifths as long as basi- 

 style, slightly curved, bluntly pointed at tip; terminal claw (Ds-C) broader 

 apically, truncate, longitudinally divided beyond middle into numerous comb- 

 like teeth. 



LARVA. (Fig. 60). — Head slightly broader than long. Antenna about half 

 as long as head, smooth; antennal tuft multiple, barbed, inserted at basal third 

 of shaft, not reaching tip. Head hairs: Preantennal (A) multiple, barbed, 

 extending near insertion of antennal tuft; lower (B), and upper (C) multiple, 

 barbed, extending beyond preclypeus; postclypeal (d) multiple, barbed, shorter 

 than upper (C) ; sutural (e) long, single; trans-sutural (f ) and supraorbital 

 long, single or branched distally; sub-basal inconspicuous, about 1 to 3- 

 branched. Upper lateral abdominal hairs short, multiple on segments I and II. 

 A large dorsal sclerotized plate present on abdominal segment VIII, often 

 present on VI and VII. Comb of eighth segment consisting of two rows of 

 thorn-shaped scales, the anterior row with about 17 to 23 short scales and the 

 posterior row with about 6 to 10 long scales (scales of anterior row become 

 larger medially and overlap the bases of those of the posterior row) ; individual 

 scale long, pointed and fringed on basal half with small spines (small scales 

 on ventral portion of anterior row are fringed apically with subequal spines) ; 

 subsiphonal tuft large, barbed, 5 to 12-branched. Siphon about three and one- 

 half times as long as basal width; pecten absent; subventral tuft with 5 to 12 

 branches as long or longer than the width of the siphon, barbed, inserted 

 beyond basal third. Anal segment longer than wide, completely ringed by the 

 dorsal plate; a small linear sclerotic plate at base of segment; lateral hair 

 single, often feathered at tip; dorsal brush consisting of a long lower caudal 

 hair and a shorter multiple upper caudal tuft on either side; ventral brush well 

 developed, confined to the barred area; gills 4, about as long as the segment, 

 the dorsal pair longer than the ventral pair. 



DISTRIBUTION. — Southern United States, north to Massachusetts and west 

 to California. It also occurs in Jamaica (54) and Puerto Rico (136). Southern 

 States: Alabama (170); Arkansas (30); Florida (96); Georgia (52); Ken- 

 tucky (140); Louisiana (96); Mississippi, Missouri, North Carolina and 

 South Carolina (52); Tennessee (170); Virginia (49). Other States: Cahfor- 

 nia (67); Delaware (106); District of Columbia (52); Illinois (42); Indiana 

 (76); Iowa (156); Kansas (128); Maryland (19); Massachusetts (180); 



