long's second expedition. 203 



ORDER NEUROPTERA. 



BAETIS Leach. 



1. B. BiLiNEATA. — Large, pale ferruginous ; inferior wings 

 luargined behind with dusky; tergum fuscous with a double 

 series of whitish lines. [304] 



Inhabits St. Peter's river. 



Head above somewhat fulvous ; beneath and front yellow ; 

 thorax, first segment yellowish-brown, blackish each side and 

 before; second segment pale brownish, a little tinged with rufous 

 and with indistinct oblique whitish lines, proceeding from the 

 longitudinal impressed line; two brown spots on the middle 

 placed transversely ; wings hyaline, whitish, with fuscous ner- 

 vures ; posterior margin of the inferiores fuscous ; tergum fus- 

 cous ; lateral margin whitish ; posterior edges of the segments 

 white above; a double series of whitish, oblique, dilated, abbre- 

 viated lines. 



Length 9 to tip of the wings one and three-tenths of an 

 inch. 



This is much the largest species of this country I have seen ; 

 it appeared in considerable numbers. 



[Belongs to Palingcnla, and is P. h'mhata Guer. Icon. Regne 

 An. pi. 60, fig. 7. — Uhler.] 



2. B. ALTERNATA. — "Wings whitish, nervures fuscous; tergum 

 fuscous, segments whitish at their bases. 



Inhabits North-west Territory. 



Body fuscous; head on the'anterior margin and geuae white; 

 thorax pale brownish-livid, yellowish near the scutel ; wings hya- 

 line, with a whitish reflexion, nervures not margined ; pleura and 

 pectus varied with yellowish; feet pale ochreous, a fuscous 

 annulus near the tip of the thighs; tergum fuscous; segments 

 whitish at base, one or two ultimate segments with two whitish 

 longitudinal lines ; venter whitish, each segment with two oblique 

 lines and two intermediate points, black ; seta whitish, with 

 regular fuscous spots alternating. 



Length of the body % from two-fifths to half an inch. 



Closely allied to the /cmoratus, nobis,* but may be distinguished 



* Western Quarterly Reporter, vol. 2, p. 162. — Ante. p. 171. 



