206 



Illinois Natural History Survey Bulletin 



Vol. 23, Art. 1 



brown or gray; tenth tergite with 

 dorsal or beaklike expansions, figs. 

 704-707 



Molanna uniophila Vorhies 



2 Molanna uniophila Vorhies (1909, p. 705); 



larva, pupa, cf , 9. 



Larva. — Fig. 709. Length 18 mm. Head, 

 pronotum and legs yellow, head with a 

 Y-shaped black mark, posterior portion of 

 pronotum black; mesonotum brown, sub- 

 divided by an irregular line into an anterior 

 and posterior portion. Head long, frons also 

 long, the anterior portion not expanded. 

 Mandibles short and stocky with three teeth 

 along apical margin. Gula almost rectangu- 

 lar, longer than wide. Mesonotum with a 

 semicircular, small antero-mesal plate, the 

 remaining membranes with a lateral tuft 

 of long setae. Gills long and filiform, most 

 of them triple, those on the second and third 

 abdominal tergites with five branches. Lat- 

 eral line forming a fringe on segments 3-7, 

 eighth segment with a sinuate lateral line 



Figs. 703-707. — Molanna, male genitalia. 



Fig. 708. — Molanna musetta, hind wing. 



, A long furrow of black scales in hind 



wings, fig. 708 musetta, p. 207 



No furrow of scales in hind wings. ... 3 

 , Lateral aspect of tenth tergite with a 



long, pointed, ventral process, fig. 



705, and with a small dorsal lobe. . 



tryphena, p. 207 



Lateral aspect of tenth tergite rounded 



at apex and with a larger or less 



definite dorsal lobe, figs. 706, 707. . 4 

 , Tenth tergite with large dorsal lobe 



and small ventral lobe, fig. 706. . . . 



uniophila, p. 206 



Tenth tergite with small dorsal lobe 



and very long, truncate ventral lobe, 



fig. 707, shaped like a duck's bill. . . 



blenda, p. 208 



Fig. 709. — Molanna uniophila larva. 



divided into an anterior portion of branched, 

 short, appressed hairs and a posterior por- 

 tion of about eight very long double hairs. 

 Anal hooks large with one or two dorsal 

 teeth. 



Case. — Fig. 710. Length 25 mm. Width 

 11-13 mm., the lateral margins built out 

 into wide flanges so that the entire dorsal 

 surface is uniformly convex and formed 

 of sand and gravel; the ventral aspect has 

 the middle tube made of fine grains. 



