Entomology of the Illinois River. 175 



I have therefore restored Paraponyx, including under it, 

 as did Lederer,* the species of Oligostigma. 



Packard has figuredf the transformations of what he 

 supposed to be II. icciusalis — a typical Hydrocampa. 

 We have bred all stages of H. olUteralis, which belongs 

 to the group of Hydrocampas once classed with Ho- 

 mophysa. There is no trace in our larva of the posterior 

 pits fig"" ^(1 by him in icciusalis; and while the pupae 

 seem to agree in relative size of spiracles, the ven- 

 tral sheath in his figure is made very long, as de- 

 scribed by Guenee for Cataclysta, this character seeming 

 to be correlated with the length of the wings in the 

 adult. The sketchy nature of the figures makes further 

 comparisons uncertain. 



The wings of the Hydrocampa moths are broad or 

 moderately so, the hind wings crossed by a pair of wavy 

 lines near middle. 



S. gyralis Hulst. 



A single example was taken flying about the cabin- 

 boat July 19. The species had been previously taken 

 by us at electric lights near the University June 17 and 

 Aug. 24, 1886. The three examples thus collected ara 

 all males, as were also Mr. Hulst's types. We have in 

 our collection also two undetermined Hydrocampas, 

 both females, which, although differing greatly in general 

 appearance from the preceding, and somewhat larger, are 

 ^n all probability the other sex of this species, as the 

 pattern is essentially the same, and the hind wings 

 scarcely differ at all. The white lines of the fore wings, 

 however, so sharply distinct in the males, are here 

 obscured by a tawny yellowish suffusion, and the dark 

 shades are indefinitely outlined. These also are from 

 electric light collections made near the University in 

 1886, on May 28 and Aug. 23 of that year. 



♦ Wien. Ent. Monatschr., VII., p. 45-i. 

 t Am. Nat. 1884, p. 824. 



