316 WILLIAM J. FOX. 



and eighth, joints 9-12 more distinctly serrated thsin in occidentalism the apical 

 joint not as long as the scape, eleventh and twelfth joints about equal in length ; 

 dorsulum shining, finely and closely puuciured ; sides of prothorax not so 

 strongly striated as in occidentaUs ; nietathorax more strongly rugose, almost 

 rugged ; the lateral margins of the posterior face of nietathorax with two strong 

 teeth or projections; tibiae not so distinctly armed as in occidentaUs ; mandibles, 

 tegulse and legs, except the middle til)iaj, which has a black line within, colored 

 like the female of occidentaUs. Length 4 — 4.5 mm. 



Montana ; Illinois. 



3. Diodontiis flavitarsis n. sp. 



%. — Of the same form as riujosus, and differs as follows: emargination of lab- 

 rum neither wide or deep; front shining, the punctures fine and close, and has 

 the appearance of being longitudinally striated, when viewed in certain positions, 

 the medial impressed line faitit, but distinct ; antennse. almost filiform, not at all 

 serrated beneath, fourth joint slightly longer than the third, joints 4 — 11 about 

 equal in length, the twelfth longer than any of the preceding nine, this joint 

 longest, but shorter than the scape; the nietathorax rugose or rugged, the lateral 

 margins of the posterior face without teeth or productions; mandibles black, 

 otherwise colored as rugosns. except that the medial tibiae are entirely yellow. 

 Length 4.5 mm. 



Colorado. One specimen. 



4. Diodoiitiis ainericauus Pack. 



" 9. Body black, shining and polished; clypeus smooth and shining; an- 

 teiuiie entirely black ; scape black; mandibles white, reddish at the tip; paljii 

 dark fuscous; surface of the head smooth polished, with much fewer, minute, 

 shallow punctures than usual, scarcely pubescent, except on the orbits, where it 

 is thinly so. Mesoscutelluni with the mesial and submesial lines distinct, par- 

 allel, very contiguous, surface anteriorly more densely and minutely punctured 

 than on the disk; metascutellum more fullj' colored than the scutellum; pro- 

 podeum with no distinct enclosure, or distinct mesial furrow; anterior portion 

 with no unequal, parallel, straight lines proceeding from the base; posteriorly 

 an irregular net-work of shallow, broad fossulets. Tegulae and insertion of the 

 wings testaceous: nervures blackish, pterostigina black ; wings iridescent; flanks 

 of the thorax distinctly corrugated on the more convex surface, smooth and 

 shining in the depressions. Legs black, tarsi dark fuscous ; tibise with two rows 

 of spinules; tibial spurs large, testaceous, and tarsal joints more than usually 

 spinose at tip, base as long. Length .22 inch." 



Brunswick, Me. (Packard). 



5. Diodoiitus Gillettei n. sp. , 



9. — Labruni • -? ; front shining with fine dense punctures, the medial 



impressed line wanting; cheeks very sparsely punctured, the vertex even more 

 so ; the anterior ocellus situated in a deep pit, so that it is much smaller than 

 either of the other two, these two in slight pits; dorsulum rather sparsely punc- 

 tured, densely so before the scutellum ; scutellum sparsely punctured, with a 

 very slight impression ; mesopleurse strongly rugose or rugged, with traces of ob- 

 lique stri» on posterior portion only; metathorax above with irregular fossuleis, 



