APPENDIX I. 



SPECIES DESCRIBED BY PEEVIOUS AUTHORS AND NOT CONTAINED IN THE 

 PRESENT MONOGRAPH. 



Say, Journal of the Academy of Natural Sciences in Phila- 

 delphia, III, p. 22. 



Limnobia Immeralis. 



Dusky, beneath pale ; wings hyaline, immaculate. 



Inhabits Pennsylvania. 



Antennae fuscous, first joint and rostrum dull yellowish ; front 

 and vertex dull cinereous ; thorax dark livid ; humerus, two 

 obsolete lines, and lateral margin as far as the wings yellowish ; 

 pleura and pectus pale yellow ; scutel and metathorax color of 

 the thorax ; nervures dark brown, corresponding in arrangement 

 with Meigen's fig. 2, pi. 6 ; feet dark brown ; tergum dull yellow- 

 ish, with a black line ; venter white. 



Length, two-fifths of an inch (fern.). 



Say, Long's Expedition, Appendix. 

 Page 359. Ptyclioptera 4-fasciata. 



Wings hyaline, with four brown bands. 



Inhabits Pennsylvania. 



Head and thorax blackish-brown ; antennas, palpi, mouth and 

 hypostoma, except near the base of the antennas, whitish ; wings 

 with four brown, subequidistant bands, of which the third reaches 

 the inner margin and the others are abbreviated ; pleura, pectus, 

 and feet yellowish-white, the incisures of the latter dusky. 



Length to the tip of the wings nearly half an inch. 



This species is infested by a parasite of the genus Ocypete. 

 It occurred in June. 



21 November, 1868. / 321 \ 



