20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 121 



Genus Allognosta Osten Sacken, 1883 



There are 4 species recognized in this genus, but only the larva of 

 Allognosta Juscitarsis (Say) has been reported (Johannsen, 1922). 

 Generic characters. — As given in the key to genera. 



Allognosta fuscitarsis (Say), 1823 

 Figures 31, 36-38 



Description. — Mature larva: length 9.5 mm; width 3.5 mm. 

 Prothoracic spiracle located in a distinct marginal notch. Other 

 characters as given in key to genera. 



Biology. — 'Little is known of the biology and life history of this 

 species. Malloch's (1917) specimen was obtained from woods near 

 Urbana, 111., while Johannsen's report (1922) stated that his speci- 

 mens were found in decaying organic matter. 



Material examined. — Rhode Island: Kingston, Aug. 20, 1942, 

 H. Knutson, 1 early instar larva from glass of milk, MSC New York: 

 Ithaca, C. Hamilton, 2 larvae, 1 puparium, CU; Ithaca, 2 early instar 

 larvae collected with larvae of Fannia species, CU. North Carolina: 

 Great Smoky Mountain National Park, Oct. 4, 1951, J. S. Ayars, 

 ace. no. 49768, 11 larvae, NCS. 



Genus Actina Meigen, 1804 



Only 1 species of this genus is known from North America, the 

 immature stages of which have never been reported. 



The characteristics that are given below are taken from a paper by 

 FuUer (1934) in which she described the immature stages of an 

 Australian species, Actina incisuralis Macquart. 



Generic characters. — As given in key to genera. 



Actina incisuralis Macquart, 1847 



Figures 40, 41, 45 



Description. — Matiu-e hirva (?) : length 9 mm. Color varying 

 between greyish brown and brown. 



Head elongated, narrow and pointed. Body strongly constricted between the 

 segments giving the larva a scalloped appearance along the sides. Dorso-laterally 

 the integument between each abdominal segment, and between the third thoracic 

 and first abdominal, is produced into a small papilla projecting outwards. The 

 thoracic segmeiits become broader passing from the head, the abdominal segments 

 are of uniform width and length, with the exception of the eighth, which is nar- 

 rower and longer than the others, more flattened and produced into two blunt 

 projections at the posterior corners (Fuller, 1934, p. 191). 



Setal arrangement typical for family and subfamily. 



Biology. — Fuller (1934) reported that larvae of this species "were 

 found in abundance on the undersurface of a sheep carcass" and "on 



