Vol. 5, p. 19-20. January 30, 1922 



Occasional Papers 



OF THE 



Boston Society of Natural History, 



A NEW DRAGONFLY FROM NEW ENGLAND. 



BY R. HEBER HOWE, JR. 



The male specimen on which this species is based, was collected at 

 Squam Lake, New Hampshire, by Dr. G. M. Allen on June 22, 1907, 

 and was given me for determination by Mr. C. W. Johnson of the 

 Boston Society of Natural History. After a careful study of the 

 specimen I was unable to name it, and with the aid of Mr. Nathan 

 Banks compared it with the gomphine material in the entomological 

 collections of the Museum of Comparative Zoology, Cambridge, with- 

 out taxonomic success. I therefore suggested to Mr. Johnson that he 

 send it to Mr. E. B. Williamson of Bluffton, Indiana, for his opinion. 

 Writing to Mr. Johnson under date of October 8, 1921, Mr. Williamson 

 replied: "I studied the specimen this noon hour and I don't know it, 

 and I believe it is undescribed." Dr. P. P. Calvert has also kindly 

 studied the specimen and agrees with me that it is new. I am there- 

 fore describing it, naming it after my friend, and its collector, whose 

 odonate captures in New Hampshire have added many valuable dis- 

 tributional records. Dr. Allen now recalls nothing about the capture 

 of this particular gomphine, though it was probably caught near the 

 Harvard Engineering Camp. 



Gomphus alleni, sp. no v. 



Male: total length of abdomen 34 mm.; length of hind wing 26 mm. Colors 

 dark brown, black, and yellow. Head yellow except vertex, antennae, hind 

 edge of occiput, rear base of frons, tips of mandibles, fronto-nasal suture, and 

 back of head (except for a patch on either side) which are brown or black. 

 Post-ocellary ridge tuberculate, occiput without spine, hind margin nearly 

 straight. Prothorax brown with yellow spot at either end of median lobe, and 

 geminate median spot; a median spot on hind lobe. Mesothorax dorsally 

 brown, with the mesothoracic semicollar yellow, slightly broken at mid-dOrsal 

 carina, which has a short, central (1 mm.) yellow line; a pair of yellow dorsal 

 stripes (0.5 mm. wide) divergent anteriorly, joining with the external ends of 

 the semicollar; a short, narrow, yellow ante-humeral stripe widely separated 

 from a posterior spot which is almost confluent with posterior ends of dorsal 

 stripes. Lobes between wings yellow. Meso- and metathorax laterally yellow 

 except for lateral suture stripes. Ventrally yellow. Legs dark brown, more 

 or less spinous and villous, coxae and first and second femora yellow basally. 

 Wings hyaline, veins brown or black, pterostigma membranule pale brown, 

 costal margin 2 mm. long. Two cells between AI and A2 at their origin with 



