76 



The $ type, which has been in the Canadian National Collection 

 for some time, is in poor condition and I should scarcely have 

 ventured to describe the species as new if it had not been for the 

 characteristic genitalia, in which the apices of the penes are drawn 

 out into long narrow points (PI. 6, fig. 4). 



Cinygma bipunctata, sp. nov. 

 Male. — Almost entirely deep black brown, the ventral surface of the ab- 

 domen somewhat paler and with the posterior margin of each segment nar- 

 rowly bordered with dull whitish, this color on the rear segments extending to 

 the lateral portions of the dorsum. Setae whitish with narrow dark rings. Fore 

 femur deep brown, tibia pale brown, tarsi dirty whitish with joint 1 about two- 

 thirds the length of 2; hind legs dull yellowish, the femora with prominent 

 deep-brown median and apical spots. Wings hyaline with faint brownish tinge 

 at extreme base, the longitudinal veins pale brownish, the cross-veins colorless 

 and very indistinct except in apical area. 



Female. — Quite similar to the $ . Length of body 6 mm.; of fore wing 8 mm. 



Holotype. — $ , Wales, Maine, June 18, 1907 (C. A. Frost) ; in the collection of 

 the Boston Society of Natural History. 



Allotype. — ?, Squam Lake, New Hampshire, July 2 (G. M. Allen); in the 

 collection of the Boston Society of Natural History. 



Paratype. — $ , same data as allotype; No. 775, in the Canadian National 

 Collection, Ottawa. 



The species has a superficial resemblance to Choroterpes basalis 

 but the paired intercalaries between the first and second anal veins 

 and the type of genitalia (PL 6, fig. 5) clearly indicate the above 

 generic reference. The specimen serving for the slide of the geni- 

 talia would appear to have an extra joint in the forceps but I pre- 

 sume that this is an abnormal condition. 



EXPLANATION OF PLATE 6. 



Male genitalia of: 1. — Leptophlebia johnsoni, sp. nov.; 2. — Ephemerella 

 temporalis, sp. nov.; 3. — Siphlonurus novangliae, sp. nov.; 4. — Siphlonurus 

 rapidus, sp. nov.; 5. — Cinygma bipunctata, sp. nov 



