OF NATURAL HISTORY. 755 



% Head and base of the mandibles with a golden reflection : 

 anal segment reflecting silvery. 



Length under half an inch. 



The black tibiae and tarsi will at once distinguish this species 

 from aurulenta F., than which it is also smaller. 



3. L. AURULENTA F. {Larra) Sjst. Piez. p. 220. [372] 



Lyroda. 

 t t Stemmata, three. 



4. L. TRILOBA. — Deep black, immaculate : head anterior to 

 the antennae with a slight sihery reflection : mandibles dull ru- 

 fous towards the base ; collar somewhat trilobate, or having above 

 an obvious angle in the middle and a more obtuse one on each 

 side ; thorax having a distinct, impressed, longitudinal line be- 

 fore ; wings purplish fuliginous, almost opake ; recurrent ner- 

 vures rather distant at their junction with the second cubital cel- 

 lule ; tergum in a particular light, more obviously sericeous on 

 the posterior margins of the segments. 



Length over half an inch. 



This has very much the appearance q^ Larra eefhiojjs noh., but 

 is much larger. In that species also the collar is emarginate in 

 the middle, the wings are but very slightly tinted, and the recur . 

 rent nervures approximate at their junction with the second cu- 

 bital cellule ; it has but one ocellus, and the mandibles are not 

 obviously armed with a tooth on the inner edge. 



5. L. SUBITA. — Black; tergum, segments margined with a 

 whitish reflection ; metathorax wrinkled above. 



Inhabits Indiana. 



$> Body black : head before with a somewhat silvery reflec- 

 tion : collar with an abruptly elevated angle in the middle ; wings 

 at tip dusky ; recurrent nervures entering the second cubital 

 cellule, at a distance from each other ; third cubital cellule but 

 little narrowed : metathorax with small, transverse wrinkles on 

 the disk as well as on the sides : tergum, posterior margins of 

 the segment with a silvery reflection. 



Length [373] 



Kesembles caltptera, but may be distinguished by the greater 

 width of the third cubital cellule ; by the greater <listance be- 

 1837.] 



