12 Psyche [February 



tooth on inner surface near apex, and with numerous minute spines, stouter on 

 inner surface; fore tibi;e with slenderer spines; fore tarsi with a blunt tooth on 

 inner surface. 



Abdomen slender, about equal in width to the pterothorax. Tube about three- 

 fourths as long as head and a little less than half as wide at apex as at base, paler 

 in apical half. Marginal abdominal bristles (excepting those on segment 9, which 

 are pointed and about equal in length to tube) moderately short, blunt, yellowish; 

 terminal bristles slightly longer than tube, brown, pointed. 



Measurements of holotype: Length 2.93 mm.; head, length 0.468 mm., width 

 0.324 mm.; prothorax, length (along median dorsal line) 0.204 mm., width (inclusive 

 of coxjej 0.558 mm.; pterothorax, width 0.552 mm.; abdomen, width 0.552 mm.; 

 tube, length 0.348 mm., width at base 0.122 mm., at apex, 0.066 mm. 



Antennal segments: 1 



Length {n) 78 



Width (At) 49 



Total length, 0.877 mm. 



Described from one female taken in flight, by Lieut. A. W. 

 Jobbins-Pomeroy,. at Ossidinge, Kamerun, in Octoberj 1915. 



EXPLANATION OF PLATE IV. 



(Minute pubescence not shown.) 



Fig. 1. Podotkrips denticeps sp. nov., head and prothorax, female, holotype. 



Fig. 2. Pselaphothrips pomeroyi gen. et sp. nov., head and prothorax, female, 

 holotype. 



Fig. 3. Pselaphothrips pomeroyi, segments 3 and 4 of right antenna, female, holo- 

 type. 



Fig. 4. Phhrothrips coriaceus Haliday, segments 3 and 4 of right antenna, 

 female. 



Fig. 5. Acanthothrips albintfafus Hood, segment 3 of right antenna, female. 



Fig. 6. Acanthothrips magnafemoralis Hinds, segment 3 of right antenna, female. 



Fig. 7. Acanthothrips nodicornis Renter, head, female. 



A PRELIMINARY LIST OF THE ODONATA OF CONCORD, 



MASS. 



By R. Heber Howe, Jr., 

 Concord, Mass. 



Two years ago I interested one of my students in making a 

 collection of the local dragon flies of Concord for the Thoreau 

 Museum of Natural History of the Middlesex School. This stu- 



