416 THE CANADIAN ENTOMOLOGIST. 



The antennse are about 3^ the length of the body, the second joint 

 short, the third more than twice as long, the fourth barely longer than the 

 two preceding. The thorax is nearly twice as wide as long, the surface 

 shiny and finely punctate, the depression very deep and extending nearly 

 from side to side, sinuation of the sides short and well marked, the 

 punctuation of the elytra coarse, confluent and granulate between the 

 punctures, becoming obsolete at extreme tip. The cariniform tubercle 

 places this species in Baly-Gahan, section 2, division C, near ambitiosa Er. 



This species has been distributed with the manuscript n^imtnigrotibi- 



alis Jac. A pair of co-types has been sent me by Messrs. Staudinger & 



Bang-Haas. Other examples are in my collection. The 9 co-type has 

 the elytra cyaneous blue instead of black ; my other two $ 's are black. 



D. pallens, nov. sp. 



Head black, antennae Yz length of body, black, base of the first joint 

 and last three joints (apex of the eleventh excepted) pale. Thorax pale 

 yellow, transverse, depressed, punctured, trifoveate, scutel black, elytra 

 pale yellow, smooth, shining, sparsely and finely punctulate, with two trans- 

 verse depressions at and behind the middle respectively, suture just back 

 of the scutel, very narrowly piceous, beneath yellow, inclined to piceous, 

 legs yellow, tibiae and tarsi black. Length, 7^ mm. 



One (^?) Carrillo (type), 2 ( $ ?) San Carlos, Costa Rica; coll. 

 Schild-Burgdorf 



The two San Carlos examples differ from the type in that the 7th and 

 8th joints of the antennae are more or less flavous. The type has the 8th 

 joint lighter at the apex than the base, joint 2 short, 3 twice as long, 4 a 

 trifle longer than the two preceding. In the $ the third joint is obviously 

 longer than twice the second. 



The thorax is twice as broad as long, strongly sinuate and broadly 

 margined at the sides behind ; there is an obsolete median third fovea 

 visible between the two side ones ; the nearly parallel elytra have a well- 

 marked humeral groove, making the shoulder prominent, and a broad, 

 smooth elevation near the suture making a well-marked sutural depres- 

 sion ; the median depression is deeper than the rear one, but both are 

 easily visible with the naked eye ; the rear one gives the appearance of a 

 broad, smooth elevation on the convexity. Near subimpressa Jac, from 

 Costa Rica. 



