LIST OF ILLUSTEATIOSrS. XI 



On the Taxonomy, Biology, and Distribution of the biting lice of the 



FAMILY GyROPIDAE 



By H. E. Ewing 



Facing page 



1. Ventral views of the left tarsus of the anterior pair of legs of some of the 



different species of Gyropidae 42 



Notes and Descriptions of two-winged flies of the Family Dolich- 



OPODIDAE from AlASKA 



By M. C. Van Du zee 



1. Dolichopod flies from Alaska 16 



TEXT FIGURES 



Paleocene primates of the Fort Union, with discussion of relation- 

 ships OF Eocene primates 



By James Williams Gidley 



Page 



1. Paromomys maturus. Portion of a right lower jaw carrying posterior 



four cheek teeth. A, crown view of teeth; B, inner side view of jaw 

 andteeth. X 4/1 4 



2. Paromomys maturus. Portion of left maxillary with posterior four 



cheekteeth. A, palate view. B, outer side view. X 4/1 4 



3. Paromomys depressidens. Portion of a left lower jaw carrying the three 



molars. Crown view. X 4/1 5 



4. Palaechthon minor. A series of three upper molars of the left side. 



X 4/1 7 



A Revision of the North American species of ichneumon-flies belong- 

 ing TO THE GENUS MeTEORUS HaLIDAY 



By C. F. W. Muesebeck 



1. Wings of Meteorus hyphantriae Riley. Veins.— Anterior wing: AB' = 

 costa; BC = stigma; CH'D = metacarpus; HKH'=radius; GK'G' = 

 cubitus; FJ' = medius; J'I'P=discoideus; PP' = subdiscoideus; 

 UT' = submedius; T'U' = brachius; JJ' = basal vein; KK' = lst inter- 

 cubitus; LL' = 2d intercubitus; K'I' = recun'ent vein; TT' = 

 nervulus. Posterior wing: AJB = subcostella; HH' = radiella; GG' = 

 cubitella; FJ' = mediella; UT' = submediella; T'U' = brachiella; JG = 

 upper abscissa of basella; GJ' = lower abscissa of basella; J'T' = nerv- 

 ellus. Cells. — 2 = radial cell; 3 = cubital cells; 4 — median cell; 5 = 

 discoidal cells; 6=submedian ceU; 7 = brachial cells; 8 = anal cell; 

 ll = costellan cell; 12 = radiellan cell; 13 = mediellan cell; 14 = 

 cubitellan cell; 15 = submediellan cell; 16+18=discoidellan + brac- 

 hiellan cells; 17 = anellan cell. The lettering and numbering used 

 are those emploj^ed by Rohwer and Gahan in their Horismology of 

 the Hymenopterous Wing, Proc. Ent. Soc. Wash., vol. 18, 1916, pp. 

 20-76 5 



