ART. 10. NEW SPECIES OF THE FAMILY TIPUUDAE AI^EXANDER. 9 



penis-guard long, slender, straight, the extreme tip slightly decurved; 

 gonapophyses slender, straight. 



Male. — Length about 4.8 mm.; wing 5.5 mm. 



Rostrum light yellow; palpi dark brown. Antennae dark brown 

 thi'oughout. Head brownish gray. 



Pronotum yellow, brown medially. Mesonotal praescutum brown, 

 the lateral margins and humeral regions broadly yellow; pseudo- 

 sutural foveae elongate, shiny brown; remainder of the mesonotum 

 brown, the median area of the scutum, posterior margins of each 

 scutal lobe and the caudal margin of the scutellum obscure yellow; 

 yellow postnotum grayish pruinose caudally. Pleura yellowish 

 white with a conspicuous, dorsal, brownish gray stripe extending 

 from above the fore coxa caudad to the lateral sclerites of the post- 

 notum, passing above the base of the halteres; sides of the meso- 

 steinum brownish gray, the yellowish white stripe between the 

 broAvnish gray areas broad; median area of the mesosternum broadly 

 yellow. Halteres elongate, brown, the base of the stem yellow. 

 Legs with the coxae obscure yellow, the bases more or less infuscated; 

 trochanters testaceous; remainder of the legs brown, darker distally. 

 Wings with a faint gra^ash tinge; stigma brown; veins dark brown. 

 Venation: Sc^ ending opposite the origin of Rs, Sc^ at its extreme tip; 

 Rs long, arcuated, about equal' to or a little longer than R2+3; R^ 

 straight; deflection of i^^+g very short; basal deflection of Cu^ 

 beyond the fork of M, the distance about equal to two-thirds the 

 basal deflection of M^+2' 



Abdominal tergites brown; sternites obscure yellow. Male hypo- 

 pygium with the pleurites relatively long and stout, the outer caudal 

 angle produced into a blunt lobe; two pleural appendages, the outer 

 appendage elongate, slender basally, near midlength dilated into an 

 obhque blade; inner pleural appendage a flattened subcircular blade, 

 the caudal margin produced into a powerful, straight, black spine, 

 the proximal end produced into a short lobe that bears two powerful 

 setae. Penis-guard long and slender, extending caudad beyond the 

 level of the pleural appendages, straight, the small pale apex slightly 

 decurved, hood-shaped; gonapophyses appearing as two small, 

 slender, blackened rods at about midlength of the guard and ap- 

 pressed to it. 



Described from two males, coflected at Cho, Plumas County, 

 California, July 9, 1916 (H. G. Dyar). 



Type.—C&t. No. 26087, U.S.N.M. 



RHABDOMASTIX (SACANDAGA) BOREAUS, new species. 



Antennae black, the basal segment obscure yeflow; pronotal 

 scuteflum yellow; mesonotal praescutum dark brown; pleura brown- 

 ish yeflow, variegated with dark brown; femora dark brown, the 

 20183— 25— Proc.N.M. vol.64 11 



