76 CYRTIDAE OF NORTH AMERICA 



EXPLANATION OF PLATES 



All figures were drawn free hand by the author and unless otherwise stated, 

 the drawings were made from the specimens. A binocular microscope was 

 used in this work. 



Plate I ■ 



Types of wing venation in the Cyrtidae 



Fig. 1. Actual length, 15.5 mm. The lettering as in Verrall's figure in Brit- 

 ish Diptera. a. Costal vein. b. Auxiliary Vein. c. First long- 

 itudinal vein. d. Second longitudinal vein. e. Third longitudinal 

 vein, el Upper branch of the fork of third vein, e- Lower branch 

 of the fork of third vein. f. Fourth longitudinal vein, f^ Upper 

 branch of fourth vein, f^ Second branch of fourth vein, f^ Third 

 branch of fourth vein. g. Fifth longitudinal vein, gi Upper 

 branch of the fifth longitudinal fork, g^ Lower branch of the fifth 

 longitudinal fork. h. Sixth longitudinal or anal vein. i. Auxiliary 

 vein. Fraefurca — common stem of second and third veins. Am- 

 bient vein — continuation of costa around the posterior wing margin, 

 w. Humeral cross-vein. x. Discal or middle cross-vein. y. 

 Lower cross-vein. Anal cross-vein — g^ (lower branch of fifth 

 vein). 1. Costal cell. 2. Subcostal cell. 3. Marginal cell. 4. 

 Submarginal cell. 4a. Second submarginal cell. 5. First posterior 

 cell. 6. Discal cell. 6a. Second posterior cell. 6b. Third pos- 

 terior cell. 7. Fifth posterior cell. 8. Auxiliary cell. 9a. Upper 

 (or first) basal cell. 9a-. Second upper (or outer first) basal cell. 

 9b. Second basal cell. 9c. Anal cell. 10. Alula. 



Fig. 2. — Actual length, 7 mm. 



Fig. 3. — Actual length, 9 mm. 



Fig. 4. — Actual length, 5.5 mm. 



Fig. 5. — Actual length, 7 mm. Redrawn from Verrall. 



Fig. 6. — Actual length, 8 mm. 



Fig. 7. — Actual length, 5 mm. 



Fig. 8. — Actual length, 6 mm. 



Fig. 9. — Actual length, 4.2 mm. 



Plate II 



Fig. 10. — Lasia scrihae O. S. 



Fig. 10a. — Lasia scrihae O. S. Head from front, with proboscis and antennae 



cut away. 

 Fig. 11. — Lasia scrihae O. S. Outline drawing of side view. 



