Art. 23 GENUS CYLINDROMYTA MEIGEN ALDEICH 19 



CYLINDROMYIA ATRA Roeder 



(Figs. 11. 29) 



Oci/ptera atra Roder, Stett. Ent. Zeit., 1885, p. 344.— Van der Wulp, BioloRia, 

 Dipt., vol. 2, 1903, p. 450.— GiGLio-Tos, Ditt. del Me.ssico, vol. 3. p. 3, 1894 



(Mem. R. Accad. Sci. Torino, ser. 2, vol. 44.) 

 Ocyptera minor Roder, Stett, Ent. Zeit., 1885, p. 344. 



A large shining black species Avithoiit red on the abdomen. 

 Three sternopleiirals. Abdomen with two silvery, pruinose cross- 

 bands, the posterior one including most of the third segment; fourth 

 segment shining black with eight bristles. 



Male. — Fifth sternite with a narrow excision in the center, on each 

 side of which is a slight prolongation followed by an emargination, 

 beyond which at the side are a couple of flattened spines; second 

 principal tergite of the abdomen with two or three pairs of long de- 

 pressed bristles at the hind corners below next to the median line. 

 Genital segments dark brown or black. Posterior forceps united, 

 soft, deeply grooved behind in profile, of uniform width almost to 

 their tip, then drawn out in a point on the anterior edge. Anterior 

 forceps shining brown, rather broadly and evenly curved forward 

 with a rather sharp apex. 



Female. — Similar to male, the abdomen in profile rather deeper, 

 not provided with a special group of short spines. Genital segments 

 shining black, the last one piceous on the upper side, sloping rather 

 gradually toward the hooks which are large and long, moderately 

 divergent and curve gently forward. Front tarsi not perceptibly 

 flattened. 



Length, 9 mm. 



Redescribed from 1 male from Porto Rico (W. V. Tower) in the 

 United States National Museum, and 1 female from the American 

 Museum of Natural History, collected at Barros, Porto Rico. 



CYLINDROMYIA BAKERI, new species 



(Fig. 5) 



Male. — Very similar to atra., but readily distinguished by the 

 character given in the table. In the single specimen the abdominal 

 bands are narrower and more sharply defined, especially the posterior 

 one. The genital segments are brown, the posterior forceps of the 

 same color are chitinized, very short and rather bluntly pointed. 

 The anterior forceps are shining brown and broader on the basal part 

 than in any other known species. They are bent but little forward 

 and have a broadly rounded apex ; the fifth sternite is rather broadly 

 emarginate in the middle and deeply excavated outside of this. 



The female is imknown, but I have ventured to assume that it 

 <jan be distinguished by a silvery s])()t above tlie posterior thoracic 

 spiracle as in the male. 



Length, 9 mm. 



