22 PEOCEEDINGS OF THE NATIONAL MUSEUM vor. 60 



X. nigromaculata Jones may j^rove to be a dark-bodied variety of 

 this species. (Type, in University of Nebraska). 



X. nemoi^iTn has been recorded from Montreal, California, Oregon, 

 New Hampshire and Massachusetts. 



Type locality. — ^Walnut Creek, California. 



Type.—C2it. No. 27317, U.S.N.M. 



Holotype male; allotype female; five paratypes. 



Distribution. — California, Walnut Creek, April (W. M. David- 

 son) ; Sausalito, July 13 (J. C. Thompson); Washiniiton, Seattle; 

 Colorado, Locality? 7,800 feet; British Columbia, Kaslo, June 15 

 (R. P. Currie). 



XYLOTOMIMA DUBIA, new species 



Male — Head broadly subtriangular; ocellar triangle rather broad, 

 fore ocellus farthest removed ; ocellar triangle clothed with fairly 

 long, sparse, pale pile ; frontal triangle and face heavilj^ coated with 

 white pollen; antennae yellowish brown; third joint subquadrate; 

 arista shorter than width of face ; mesonotum dark aeneous with four 

 obscure stripes, clothed with short pale pile, darker posteriorly and 

 longer, sparse black hairs ; metasternum pilose ; hind femur enlarged, 

 spinose on its entire lower surface; second tergite with opaque an- 

 terior and posterior margins connected by a median opaque band, 

 with a pair of large quadrate dark aeneous spots which extend over 

 the sides ; third tergite similarly marked but the aeneous spots border 

 onto the anterior margin; fourth entirely dark aeneous; basal lobes 

 of styles large, the styles small, rounded, about the size of the cerci ; 

 wings nearly hyaline; discal cross vein joining discal cell a little 

 beyond middle ; squamae white ; halteres yellow ; metathoracic spira- 

 cle distinctly smaller than third antenna! joint. Length, 9 mm.; 

 wing, 7 mm. 



A female specimen, North Westminster, British Columbia, deter- 

 mined b}^ Coquillett as X. metaJlifera Bigot is closely related if not 

 the same. It has a broader than long third antennal joint and the 

 fourth tergite is opaque black on front and hind margin with a 

 slight opaque band extending between. 



Type locality. — Juliaetta, Idaho. 



Type.— Cvit. No. 27318, U.S.N.M. 



Distribution. — Idaho; Juliaetta (J. M. Aldrich). 



XYLOTODES, new genus 



Type. — Brachypalpus inarinatus Hunter. 



Metasternum pilose; head triangular; metathoracic spiracle dis- 

 tinctly smaller than third antennal joint; arista much shorter than 

 width of face at middle; third antennal joint broader than long; 

 face, below eye, broader than length of third antennal joint; hind 



