Vol. xxvi] ENTOMOLOGICAL NEWS. 1/2 
lower pair of which are the larger. Gonapophyses small, pale, feebly 
chitinized, cylindrical, on the cephalic face at two-thirds the length 
with a feeble chitinized tooth. 
Habitat. — Eastern United States and Canada. 
Holotype, $, Sacandaga River, Fulton Co., N. Y., June 26, 
1914 (Alexander). 
Allotype, 2 , topotypic. 
Paratypes, 30 5 , 2 , topotypic. 10 $ , 2 , Truro, Nova Sco- 
tia, July 7 to 26, 191 3 (Matheson). 
This interesting species has long been confused v^^ith 
Gonomyia cognatella O. S., but has little in common v^ith that 
insect. It is more closely related to G. hlanda O. S., but is 
easily separated by the unmarked wings. The cell ist M^ open 
by the atrophy of the outer deflection of vein M^ is found 
only in cognatella, hlanda and mathesoni in Eastern North 
America. These three species may be separated as follows : 
1. Basal deflection of Cm at the fork of M; Sc short ending just 
before the origin of Rs. cognatella O. S. *. 
Basal deflection of Cui far before the fork of M; Sc long, ending 
beyond the origin of Rs. 2. 
2. Wings spotted. blanda O. S. t- 
Wings unmarked. mathesoni sp. n. 
This species is named in honor of the collector of the para- 
types from Nova Scotia, Dr. Robert Matheson, of Cornell 
University. 
The insect, both in New York and in Nova Scotia, is found 
on rich vegetation along the banks of rivers. The Tipulidae 
found in association with this species include the following: 
Antocha sa.vicola O. S., Cryptolabis paradoxa O. S., Rhabdo- 
niastix (Sacandaga) Hava Alex., Gonomyia sulphnrella O. S., 
etc. 
* cognatella Osten Sacken; Proc. Acad. Nat. Sci., Phila., 1859, 230; 
Monographs of the Diptera of North America, IV, 1869, 181, pi. IV, 
fig. 18 (male genitalia) ; 23rd Report N. Y. State Entomologist, 1907, 
Needham, Crane-flies of New York, pi. 24, fig. 4 (wing). 
t blanda Osten Sacken; Proc. Acad. Nat. Sci. Phila., 1859. 231; 
Monographs of the Diptera of North America, IV, 1869, 182, 1^3, pi. 
IV, fig. 17 (male genitalia) ; 23rd Report N. Y. State Entomologist, 
1907, Needham, Crane-flies of New York, pi. 24, fig. 5 (wing). 
