814 CHARLES PAUL ALEXANDER 



Limnobia triocellata 0. S. 



1859 Limnobia triocellata 0. S. Proc. Acad. Nat. Sci. Phila., p. 216. 



Limnobia triocellata is a common crane-fly in eastern North America. 

 It is closely allied to the European L. bifasciata Schr., the immature stages 

 of which have long been known. 



Johnson (1906:2) found larvae of this species in a fungus at Riverside, 

 Massachusetts, on August 21, 1904, which pupated on the 22d and emerged 

 on the 30th and 31st, thus giving a pupal duration of about nine days. 

 Malloch (1915-17 b : 215-216) found larvae and cast pupal skins in an Agari- 

 cus at Urbana, Illinois, in September of 1915. The writer found larvae 

 of Limnobia triocellata in a species of Fomes, associated with the larvae 

 of L. cinctipes and Ula elegans, at Gloversville, New York, on September 



15, 1912. C. H. Popenoe found larvae at Great Falls, Virginia, on Sep- 

 tember 8, 1912, in the fungi Hypomyces Lactifluorum (Schw.) Tul. and 

 Armillaria sp., the adult flies emerging on October 7, 1912. Other speci- 

 mens from the same place found on October 9, 1913, in a species of Clito- 

 cybe, produced adults on October 20. Scores of specimens were taken in 

 Boletus felleus at Bradley Hill, Maryland, the flies emerging on July 



16, 1914. 



Larva. Length, 10-18 mm. 



Diameter, 1.2-1.4 mm. 



Coloration a little more yellowish than that of Limnobia fallax. Species very close to 

 fallax in all details. Ventral welt on abdominal segment 1 well developed, but dorsal welt 

 lacking or very reduced. Spiracular disk (Plate XXVI, 94) rather large, exposed; circular 

 spiracles large, separated by a distance less than the diameter of one; lobes surrounding 

 disk small and indistinct. 



Pupa. Length, 12-15 mm. Not very different from other species of genus described 

 herein. 



Nepionotype. Great Falls, Virginia, September 28, 1913. 

 Paratypes. With the type. 



Genus Libnotes Westwood (derivation obscure) 

 F 1876 Libnotes Westw. Trans. Ent. Soc. Lond., p. 505. 



Libnotes is a small genus (about thirty-five species) of rather large 

 crane-flies, which are chiefly Oriental in their distribution altho three 

 species occur in South and Central Africa. The species Libnotes per- 

 kinsi (Grimsh.) has been considered as being a Limnobia, but it seems 



