200 Journal New York Entomological Society, t^'o'- xxv. 



Greyish brown species without broad yellow band on margin of pro- 

 notum 5. 



5. Margins of cheeks not strongly sinuated ; lateral margin of metopidium 



rounded above humerals, when viewed from front . . pubescens Emm. 



Margins of cheeks strongly sinuated ; lateral margin of metopidium straight 



above humerals, when viewed from front 6. 



6. Clypeus distinctly produced beyond line of face; species small. 



compacta n. sp. 

 Clypeus not distinctly produced beyond line of cheeks ; species larger . . 7. 



7. Face and metopidium bright yellow, marked with black ; longitudinal and 



apical bands of pronotum yellow fraterna n. sp. 



Markings as above white 8. 



8. Species large; last ventral segment of female broadly sinuate. 



salamandra Fairm. 

 Species smaller; last ventral segment of female not so broadly sinuate. 



flaviguttula Godg. 

 Ophiderma salamandra Fairm. 



Ophideriiia salamandra Fairm., Ann. Soc. Ent. Fr., ser. 2, Vol. IV, p. 493. 

 1846. 



This is the largest species in the genus. The female is lighter 

 brown than male, pale markings sometimes very indistinct in female 

 but usually very clear in male. Head is very broad which helps to dis- 

 tinguish it from 0. flaviguttula Godg. Margins of the cheeks strongly 

 sinuate. It is known to feed on Qucrcus virginana in Texas. Its 

 range includes the entire eastern half of the United States. 



Ophiderma flaviguttula Godg. 



Ophiderma flaviguttula Godg., Bull. 111. Lab. Nat. Hist., Vol. Ill, p. 439, 

 1894. 



Distinctly smaller than salamandra Fairm. to which it is most 

 closely allied. The species is supposed to occur everywhere east of 

 the Rocky Mountains. 



Ophiderma pubescens Emm. 



Ophiderma pubescens Emmons, Nat. Hist. N. Y. Agri. of N. Y., Vol. V, 

 p. 157, 1854. 



Generally lighter and smaller than salamandra Fairm. Other 

 characters given in the key will separate this species from salamandra. 

 It has practically the same distribution as the preceding species. 

 Found on Qnercns sp. 



