NO. 2178. THE GENUS BEACON FABRICIUS—MORRISON. 319 



oval, the outline flattened behind and bulging in front, black; ocelli 

 arranged in a triangle with the lateral ocelli nearer to each other 

 than to the median ocellus; antennae about two-thirds the length of 

 the body, stout, black, 42-segmented, thickest at segments 2-6, and 

 gradually and uniformly tapering to the tip, scape short, broad and 

 flattened; scape and second segment shining and sparsely punctured 

 and black-hairy, the rest dull; labrum broad oval in outline, nearly 

 circular, strongly arched transversely and straight in profile, black, 

 sparsely punctured and hairy, the lower margin not elevated to form 

 a marginal ridge; mandibles black; beak rather short, black, the 

 labial lobes pale yellowish; maxillary and labial palpi black, with 

 scattered whitish hairs, the first two segments of the maxillary palpi 

 much thicker than the rest, and cyhndrical, the tliird more slender 

 and somewhat clavate, the fourth still more slender and clavate, the 

 last relatively very slender and nearly cyhndrical; the segments of 

 the labial palpi much shorter, the first stout, cylindrical, the second 

 stout, a Httle clavate, the third more slender, clavate, the fourth 

 slender, nearly cyhndrical; the last segments of both pairs of palpi 

 translucent. 



Thorax. — Black, the metathorax, mesepisterna and propodeum 

 red ; lateral lobes of the pronotum shining, lightly punctate and hairy 

 along the upper margin, the hairs blackish; a deep transverse groove 

 cutting across the apex of the pronotum, the front margin of this 

 elevated to form a sharp ridge, slightly notched in the middle (pi. 

 27, fig. 13, 14), proepisterna thickly clothed with whitish hairs, giv- 

 ing a silvery appearance in some lights, this appearance most pro- 

 nounced in two spots just below the attachment of the head; parap- 

 sidal furrows deep, rather broad, not punctured, widened in front, 

 and the two meeting behind in a wide curved angle just before the 

 scutellar fossa; the middle lobe of the mesothorax with a distinct 

 median groove, the lateral lobes with a less prominent flattened groove 

 down the middle of each; all the lobes shining and very sparsely 

 punctured and set with dark hairs, the punctures thickest along the 

 inner edges of the lateral lobes; hind angles of the mesoscutum not 

 strongly produced; the transverse fossa preceding the scutellum broad 

 and deep, with one prominent median longitudinal carina bisecting it, 

 and sometimes with faint traces of smaller carinae on each side of the 

 median carina; scutellum short, broadly triangular, with the hind 

 margin rounded and strongly depressed, then followed by a short 

 transverse ridge; mesopleurae shining, sparsely punctured, and hairy, 

 more closely so along the front margin; mesopleural groove nearly 

 obsolete, represented only by a broad depression in front of the mid- 

 dle coxae, the deep pit occurring above this groove in most species 

 represented by a short groove with flattened sides; front edge of the 

 venter produced into a prominent ridge notched in the middle, and 



