280 MAINE AGRICULTURAIv EXPERIMENT STATION. I9II. 



ff. Anterior part of pleura and center of metanotum yel- 

 low. 18. cincta. 

 ee. Wing with preapical fascia. 



f. Middle ocellus wanting; no cloud at proximal end of 



the crossvein. 19. decora. 



ff. Middle ocellus present and frequently surrounded by 



black. 



g. Wing with a distinct brown cloud at the proximal 



end of the crossvein ; lateral thoracic spots large. 



20. opima. 



g^. Wing without distinct cloud at proximal end of the 



crossvein. 



h. Thoracic spot at base of wing, small, punctiform, 



not extending down over the metapleural lobes ; 



abdominal fascia usually produced forward on 



the middle line. 21. suhlunata. 



hh. Thoracic spot at base of wing large, produced 



over the metapleural lobes; abdominal fascia? 



usually emarginate, sometimes divided, rarely 



produced. 22. bivittata. 



Leia miocenica Cockerell (Bui. Am. Mus. N. Hist. 76. 191 1) is a fossil 



from the Miocene shales of Florissant, Colorado. 



I. Leia varia Walker. 

 List of Diptera, Brit. Museum. I. 93. 1848. 



Length 3.5 mm; of wings 8 mm. Body yellow; head black 

 between the eyes, which, and the feelers are also black ; the 

 latter are yellow at the base; chest except the fore part, black; 

 segments of the abdomen bordered with black, which color 

 extends partially along the sides of the segments; legs yellow; 

 hips and thighs much paler than the shanks and feet; wings 

 colorless, each with a broad, brown irregular and interrupted 

 band near its tip ; veins brown. 



To the above may be added that the upper half of the pleura, 

 the' scutellum, metanotum and last abdominal segment are 

 brownish to black, the halteres are yellow and wings as figured 

 (Fig. 193). "Canada;" Wis., and Wyo., (W.MW.). 



2. Leia punctata Bellardi. 

 Saggio di Ditterol. Messicana, Append. 202. 1861. 

 Male. Length 4 mm. Black, shining. Lateral ocelli large, 

 black; median small, black; vertex and occiput yellowish, shin- 

 ing; antennae black; the first two joints and the under side of 



