NORTH AMERICAN COLEOPTERA. 147 



Side margin of thorax bordered with yellow. 



Elytra with three yellow spots on each variable in size or nearly absent, the 



lateral margin never entirely yellow alacris Lee. 



Elytra not maculate, the entire lateral margin narrowly yellow. 



ambiens Lee. 

 Side margin of thorax not yellow. 



Elytra entirely metallic green. laetifica Horn. 



These species are known to occur as follows : 



alacris Lee, Texas, Arizona and Mexico. 

 ambiens Lee, Texas, Arizona. 

 laetifica Horn, Texas. 



TYNDAKIS Thorns. 



T. ciiicta n. sp. — Form robust, depressed cylindrical, narrower posteriorly, 

 black, seneous beneath, elytra with a pale median fascia not reaching the suture. 

 Head convex, surface shining, slightly seneous, coarsely and moderately closely 

 punctured. Antennae black, slender (first six joints only). Thorax a little wider 

 than long, narrower in front, sides moderately arcuate, broadest at middle, base 

 slightly narrower, hind angles rectangular, disc convex, opaque, moderately 

 densely punctate, a smoother median line extending from base nearly to apex. 

 Elytra black, more shining than the thorax, not wider at base than it, gradually 

 narrower posteriorly, lateral margin finely serrulate posteriorly, the apices sepa- 

 rately rounded and quadrideutate, disc moderately convex, striate, strise punc- 

 tured, intervals flat coarsely and irregularly but not closely punctate, the apical 

 portions of the outer intervals distinctly muricate. Flanks of prothorax moder- 

 ately densely punctate with silvery white pubescence, extreme side margin 

 smooth, prosternum more finely punctured in front, coarsely and densely punc- 

 tured at tip. - Metasternum and coxal plates more coarsely punctured at middle, 

 more densely and finely at the sides and with silvery white pubescence. Abdo- 

 men with the first segment and the middle of the other segments less densely 

 punctured than at the sides where there is silvery pubescence. Legs black with 

 slight violaceous lustre. Length .44 inch ; 11 mm. (Pi. 4, fig. 1.3.) 



This insect is of the same general form as Ptosimn gibhicollis^ but 

 with a more robust facies. The median elytral band is very much 

 broader at the side margin and the posterior edge is oblique, the anterior 

 concave. 1'he color of the band is pale red at the side and yellowish 

 white on the disc. 



The genus to which I have referred this insect is represented by two 

 species from Chili, but the description by Thomson (Archives i, p. 168) 

 and Lacordaire's note ( Grenera iv, p. 66, note) apply so closely to our 

 insect that I see no reason for separating it. In our series it is most 

 closely related to Ptosima, from which it differs particularly in its simple 

 tarsal claws. 



One specimen Texas, given me by Mr. A. S. Fuller. 



