No. 39] ODONATA OF CONNECTICUT: GOMPHIDAE I33 



Ophiogomphus colubrinus Selys 



Bulletin de rAcademie royale . . . de Belgique, 21: 40: 1854. 



Nymph. — Similar to mainensis. Labium as in PI. v, Fig. ii. 



Adult, male. — Color black and yellow or green. 



Head : yellow, front with black transverse stripe at middle, 

 lower margin also black. 



Thorax : pale stripe of the mesepisterna broad, and connected 

 at the posterior end with the pale streak above the suture ; femora 

 pale, the dorsal carinae and tips only black. 



Abdomen : pale spots on dorsum of segments i to lo and also 

 on the lateral margins of the segments, that on segment 9 

 U-shaped ; inferior anal appendage with contiguous arms, the tips 

 upcurved ; accessories with tips of the hamules about the same 

 length as the basal broader portion and only slightly curved. 



Female. — Vulvar lamina about three-fourths the length of seg- 

 ment 9, the tips in contact ; occipital spines not in contact and not 

 separated by their own length at base. 



Measurements: total length, male 41, female 42 mm.; length 

 of abdomen, male 26, female 25 mm. ; length of hind wings, male 

 27, female 29 mm. 



The male differs from most other species of the genus in the 

 accessories, which are similar to aspersus. The black stripe on 

 the front is characteristic of both sexes. 



Described from a male and female in the Museum of Compara- 

 tive Zoology collection. 



Ophiogomphus anomalus Harvey 



Entomological News, 9: 60: 1898. 



Adult, male. — Color yellow or greenish and black. 



Head : pale, black as follows : all of labrum except large lateral 

 spots, frontoclypeal suture, a transverse stripe on the front, and 

 another on the dorsum in front of the ocelli; ocellar area dark; 

 occiput pale. 



Thorax : pale, with brown mid-dorsal stripe, a brown stripe at 

 mesopleural suture enclosing a pale streak, and brown mesepimeral 

 shoulders; brown marks of the shoulders, extending caudad to the 

 spiracle ; coxae pale, remainder of the legs brown. Wings slightly 

 clouded. 



Abdomen : dark brown with yellow on terga as follows : sides 

 of I, auricles and margins of 2; cephalo-lateral angles of 8, a 

 U-shaped mark on sides of 9; sides and venter of segment 10 

 pale; dorso-mesal pale spots on 8, 9 and 10 also yellow, variable; 

 superior anal appendages (Fig. 14, No. 5) tuberculate below; 

 arms of the inferior viewed from below entire, not much wider 

 at tips than at base. Accessory appendages as in Fig. 14, No. 10, 



Female. — Occiput with two long, very closely placed spines on 



