CHARLES W. HOOKER. 141 



color occurs in most orders, and Tower's explanation may 

 prove to be the right one here.* 



Table of Species. 



1. Wings fuliginous or infuscated, eyes small, only slightly emar- 



ginate 11. 



Wings hyaline or tinged with fulvous, eyes distinctly emarginate..2. 



2. Abdomen with the apex dark brown or black 3. 



Abdomen with the apex not dark brown or black 6. 



3. Abdomen beyond the second or third segments black. 



rufoniger n. sp. 

 Abdomen beyond the second or third segments dark brown 4. 



4. Base of radial vein angularly broken flavofusciis Br. 



Base of radial vein not angularly broken 5. 



5. Mesonotum with three black stripes (thorax luteous) . 



flavofuscus radialis n. subsp. 

 Mesonotum without three black stripes 10. 



6. Base of radial vein thickened 7. 



Base of radial vein narrowed (near the stigma) 8. 



7. Stramineous, wings hyaline straniiueus Tasch. 



Fulvo-ferruginous to fiavous, wings usually tinged with fulvous. 



macrurus L. 



8. Base of radial vein angularly broken aiigfulatus n. sp. 



Base of radial vein not angularly broken 9. 



9. Apex of antennae fuscous tenuig'ena Kriechb. 



Apex of antennae not fuscous 10. 



10. Discocubital vein arcuate, wings hyaline arctiae Ashm. 



Discocubital vein sinuous, wings usually tinged with fulvous. 



macrurus L. 



11. Testaceous, nervellus broken far above the middle. 



infuscatus Tasch. 

 Ferruginous, nervellus broken below the middle. ..texanus Ashm. 



Ereinotylus rufoniger n. sp. 



Ferruginous; antenncz fuscous to black; vertex flavous ; stigvia fulv- 

 ous ; radial vein with the basal half thickened and angularly broken two 

 intn. from the .stigma. 



Length, 20-25 mm. ; wing, 17-19 mm. ; spread, 36-40 mm. ; antennae, 

 25-28 mm. 



Head reddish-yellow to rufous ; vertex flavous ; antennae fuscous to 

 black, as long or longer than the body ; ocelli large, prominent, well 



* Tower, Evolution of Leptinotarsa, p. 214 : " (a) The factors most 

 potent in the modification of coloration are temperature and moisture ; 

 soil and altitude act indirectly through moisture and temperature, 

 while the influences of food, light and other factors are very slight." 



TRANS. AM. ENT. SOC. , XXXVIII. 



