348 ANNALS NEW YORK ACADEMY OF SCIENCES 



Pergande's C. erythropus, which, as Emery has stated, is merely a syno- 

 nym of Forel's mina. 



51. C. planatus Roger 



C. planatus Rogeb, Berl. Ent. Zeitschr., VII, p. 148, No. 24, ^ 9 $, 1863; 

 Dalla Torre, Catalog. Hymen., VII, p. 248, 1893; Forel, Biol. Centr. Amer. 

 Hymen., Ill, p. 141, 1899-1900. 



C. senex stirps planatus Forel. Bull. Soc. Vaud. Sci. Nat, (2) XVI. P. 81, 

 p. 97, ^, 1879; Hid., (2) XX, P. 91, p. 346, 1884. 



C. senex subsp. planatus Emery. Mem. R. Accad. Sci. 1st. Bologna, p. 775, 

 1896. 



Worker major. Length, 5-6 mm. 



Head small, as broad as long, a little broader behind than in front, with 

 straight posterior and convex lateral borders and rounded anterior corners. 

 Eyes rather large, moderately convex. Mandibles 6-toothed, with convex outer 

 borders and upper surfaces. Clypeus sharply carinate, broadly rounded in 

 front, with the anterior border feebly sinuate in the middle. Frontal area dis- 

 tinct, subtriangular, much broader than long. Frontal carinte not very strongly 

 lyrate, twice as far apart behind as in front. Frontal groove distinct. An- 

 tennae moderately long ; scapes terete at the base, slightly enlarged distally, 

 extending to the posterior corners of the head. Tliorax short, a little narrower 

 in front than the head, somewhat broader in front than behind, the dorsal sur- 

 face evenly arcuate in profile, flattened when seen from above and marginate 

 on each side, where it passes over into the somewhat concave, perpendicular 

 pleural surface. Epinotum with subequal base and declivity, the former 

 slightly convex and .square, the latter distinctly concave, the two surfaces 

 meeting with a rather sharp transverse margin. Petiole moderately high, 

 compressed anteroposteriorly, with convex anterior, flattened posterior surface 

 and rather sharp margin ; seen from behind, narrow below, expanded above, 

 with broadly rounded border, entire or feebly notched in the middle. Gaster 

 of the usual shape. Legs rather short ; tibiae without bristles on their flexor 

 surfaces. 



^ Opaque throughout, except the mandibles, which are shining, finely striated 

 and coarsely punctate on their lateral and apical surfaces. Head, thorax and 

 gaster densely punctate ; legs coarsely shagreened. Cheeks and clypeus with 

 large but rather shallow, somewhat elongated, scattered foveolse; gaster with 

 coarse, sparse, piligerous punctures. 



Hairs very abundant, erect, glistening white; covering the head, thorax, 

 petiole and gaster, especially dense and conspicuous on the epinotum and 

 gaster. Hairs on the legs somewhat shorter and more oblique ; on the antennal 

 scapes still shorter and more appressed. Pubescence on the gaster long and 

 dense ; much shorter and more dilute on the head and thorax. 



Head, thorax, petiole and legs rather dark ferruginous red ; mandibles, 

 cheeks, clypeus and often also the antennae suffused with yellow. Mandibular 

 teeth and gaster black ; femora, tibiae and tarsi often infuseated, except at the 

 articulations. 



Worker minor. Length, 3.5— i mm. 



Closely resembling the worker major, but the head smaller and with less 

 convex cheeks and the petiole thicker and bluntei*. 



