NORTH AMKRICAN HYMENOPTERA. 147 



Aiigoclilora matilda 9.— Green, with bluish aud purplish reflections; 

 clypeus produced, sides of face with coarse reticulations, apex of mandibles ru- 

 fous, flajrellum dull testaceous at tip beneath; mesoscutum and scutellum cov- 

 ered with coarse reticulations; metathorax rounded posteriorly, the disc short, 

 shorter than scutellum, hardly longer than post-scutellum, with coarse longitu- 

 dinal ridges terminating at a waved salient ridge at the edge of the declivity; 

 wings yellowish hyaline ; nervures, stigma and tegulae exteriorly dull testaceous ; 

 femora green, tibite and tarsi fusco-ferruginous, hind spur serrate with numerous 

 fine teeth ; abdomen shining, minutely punctured, with thin pale yellowish 

 pubescence. Length 7 mm. 



Hah. — Florida ; two speciraen.s taken at Inverness, Citrus County. 



Augoclilora austrina 9- — Green, with bluish reflections; clypeus pro- 

 duced, mandibles rufous at tip, flagellum towards tip testaceous; face above in- 

 sertion of antennte evenly punctured, mesoscutum anteriorly shining and slightly 

 rugose, elsewhere evenly punctured ; metathorax rounded posteriorly, disc about 

 as long as postscutellum, finely rugose with irregular longitudinal ridges; wings 

 hyaline, slightly dusky towards tips, nervures, stigma and tegulse testaceous; 

 femora and tibife exteriorly greenish, tarsi dull ferruginous, hind spur serrate 

 with numerous fine teeth; abdomen minutely punctured, clothed with thin 

 pale pubescence. Length 6 mm. 



Hah. — Florida; one specimen, taken in Citrus County. 



All of the species of Augochlora mentioned above agree in having 

 the hind spur serrate with numerous fine teeth and form a distinct 

 section of the genus. Another section, to which belong A. lucidnla 

 Sra., A. suviptuosa Sm. and A. huineralis Pttn., is characterized by 

 having this spur provided with four or five long teeth. 



Agapostemon nigricornis F. (= Halictus splendens Lep. = Agaposte- 

 mon seruginosus Sm.) 



The male can be separated from other males of the genus known 

 to me by its robust posterior femora, " femoribus posticis incrassatis," 

 Fab., Ent. Syst. ii, 313. I have eight male and female specimens 

 taken in Florida. 



Agapostenion radiatus Say (Augochlora radinta Sm., B. M. Cat. Hym. 

 i, 80 = AgapostemoH pulchra Sm.). 



It is evident that Smith has referred Say's species to Augochlora 

 and redescribed it under Agapostemon. The male of this species is 

 smaller than that of A. hicolor, has the hind femora a little more 

 robust and the metanotum more rugose. 



Agapostenion texaiiiis Cr. 



This species occurs in Illinois. The male may be distinguished 

 from those of the preceding by its white pubescence, and by its 

 metanotum with a distinct triangular enclosure. 



TRANS. AM. ENT. SOC. XX. JUNE. 1893. 



