March, 1914] WoODRUFF : OpHIOGOMPHUS JOHANNUS. 



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lobes of labium more slender and less blunt; femora and tibiae stouter; 

 throughout much less hairy; and third joint of antennae conspicuously 

 different, being much broader and slightly shorter, that of aspersus 

 being scarcely wider than first joint. By this character it may easily 

 be distinguished from the latter. 



Appended hereto are line drawings of the nymph above described, 

 its abdomen in lateral aspect, its terminal joints and appendages 

 viewed from above, and its labium including mentum. 



ft 



To Dr. James G. Needham, the describer of the imago of this 

 species, I would make due acknowledgment for his courtesy and 

 generosity in supplying me with the above specimens of 0. aspersus 

 and 0. carolus for purposes of comparison. 



