130 DIPTERA OP NORTH AMERICA. [PART III. 



curvature of the end of the fourth longitudinal vein. The black 

 coloring of the body they have in common with the species of 

 Holodasia and Apospasmica, which they approach in the whole 

 structure of their body. They differ from Holodasia in the fact 

 that the first longitudinal vein is not provided with bristles upon 

 its whole course, but at its end only. From Apospasmica they 

 differ in the shape of the anal cell, the posterior angle being only 

 acute here, while in Apospasmica it is drawn out in a long lobe ; 

 moreover, in the latter genus, the end of the fourth longitudinal 

 vein is not curved forward ; in Anacampta the picture of the 

 wings consists rather of spots, or bands consisting of spots, 

 while in Apospasmica there are complete crossbands. The 

 structure of the third antennal joint of Anacampta affords a 

 character for the distinction of it from all the other genera of 

 Ortalina, which renders any further developments superfluous. 



1. A. latiliscilla n. sp. % 9 .—(Tab. VIII, f. 19.) Nigra, thorace 

 abdoniinisque fasciis duabus ciuereo-pollinosis, capite ex rufo luteo, 

 pedibus rufis, alis nigro-maculatis. 



Black, thorax and two crossbands on the abdomen covered with gray 

 pollen; head reddish-yellow ; feet red ; wings spotted with black. Long, 

 corp. % 0.31, 9 cum terebra 0.33— 0.34; long. al. 0.26. 



One of the largest species of the genus, and broader in shape 

 than most of them. Head reddish-yellow, opaque, covered with 

 a very thin, and hence not easily perceptible greenish-white 

 pollen ; occiput more thickly pollinose with white. Front broad, 

 somewhat narrower above ; the not very distinct frontal stripe 

 very much narrowed above, of a purer yellowish color and almost 

 pollenless ; the comparatively thick pubescence of the broad 

 lateral portions of the front is inserted in very small, but distinct 

 brownish dots. Antennae ochreous-brown, the color of the first 

 two joints more yellowish, that of the third joint more brownish. 

 Ground color of the thorax, with the exception of the brick-red 

 humeral callosities, black, but altogether covered with an ashy-gray 

 pollen, which is not quite so thick on the pleurae as on the 

 thoracic dorsum. The hairs and bristles of the thoracic dorsum 

 are inserted on small, but distinct black dots. Scutellum black, 

 with a broad brick-red border, pollinose with ashy-gray. Abdo- 

 men shining-black, with black hairs and two broad crossbands 

 of whitish-gray pollen, situate on the anterior portion of the 



