THE CEANE-FLIES OF NEW YORK PART II 813 



Limnobia fallax Johns. 



1909 Limnobia fallax Johns. Proc. Boston Soc. Nat. Hist., vol. 34, p. 125. 



Limnobia fallax belongs to the solitaria group and is apparently more 

 Austral in its distribution than the other members of this group (L. soli- 

 taria O. S., L. hudsonica O. S.). 



Larvae and pupae were found by Dr. Johannsen near Ithaca, New York, 

 July 20-26, 1905. They were wrapped in silken cases covered with earthy 

 matter, and were removed from the soil near a brook. 



Larva. Length, contracted, 8-8.2 mm. 

 Diameter, 1.2-1.3 mm. 



Coloration white. 



Form stout and short, body terete. Transverse welts with chitinized points on abdominal 

 segments 2 to 7, those on dorsal surface broad, those on ventral surface narrower. Spiracular 

 disk blunt, surrounded by four indistinct lobes, the lateral pair the largest and capable of 

 close approximation, closing the large yellow spiracles. Anal gills indistinct. 



Head capsule of usual Limnobia type. Labrum (Plate XXVI, 95) broadly oval, lateral 

 angles and disk of epipharynx with tufts of long hairs; anterior margin fringed with short 

 setae; about eight sensory bristles and papillae along anterior margin. Mentum (Plate 

 XXVI, 96) large, triangular, running out into a long median apical point; lateral margins 

 with about six or seven flattened subacute teeth on each side. Hypopharynx as in this group: 

 a collar formed of two chitinized, comblike plates; the first plate rectangular, its face covered 

 with flattened scales, anterior margin with about fourteen acute pointed teeth, the two 

 outermost much the smaller, acicular; the second plate a narrow band of chitin similarly 

 ioothed, the teeth at each end large, flattened, the next tooth very narrow, acicular, the 

 remaining teeth, ten in number, flattened, acute, the middle teeth a little shorter and broader. 

 Antenna (Plate XXVI, 97) with basal segment elongate, cylindrical, and apical papilla or seg- 

 ment very tiny, disklike. Mandible (Plate XXVI, 98) large, moderately broad, with apical 

 tooth prominent, two large dorsal teeth, and a row of about five or six comblike teeth along 

 ventral cutting edge, the most basal being short and blunt. Maxilla (Plate XXVI, 99) 

 about as in this tribe, cardines and stipites large and simple; palpus large. 



Pupa. Length of cast pupal skin, 10-13 mm. 



Labrum (Plate XXVI, 100) triangular, apex obtuse. Labial lobes prominent, subquadrate. 

 Posterior margin convex medially. Pronotal breathing horns (Plate XXVI, 101) flattened, 

 subcircular in outline, with an outer marginal row of breathing tubercles. Leg sheaths 

 ending just before apex of fourth abdominal segment; tips of tarsi about on a level, or those 

 of fore legs a little the longer. Band of spicules on seventh tergite, slightly constricted 

 medially. Female cauda (Plate XXVI, 102 and 103) with tergal valves a little longer than 

 sternal valves, and more acute at their tips; a small tubercle on outer margin of outer lobes 

 Defore tips. 



Nepionotype. Ithaca, New York, July 21, 1905. 

 Neanotype. Cast pupal skin with type larva. 

 Paratypes. One larva and three pupal skins. 



