1^2 PSYCHE [Oct.-Uec. 



whole occur inland. The third, however, is a maritime group. The males have 

 white abdomens and the faces are produced and pointed. Nemotelus pallipes Say 

 is an anomalous species of the group. It is interesting to note that apparently so 

 trivial a character as the relative extent of the dark color on the tibiae should be 

 correlated with much more striking differences. Another remarkable correlation 

 was noticed for the species in the collection. Those with black males (iV! luiicolor^ 

 crassHs, carbonarius, canadensis, and arator) have the third vein of the wings sim- 

 ple ; those species whose males have whitish abdomens have the third vein fur- 

 cate {IV. whceleri^ frinotatiis, and bell nl us). Nemotelus bruesii, however, is anomalous 

 in this as well as in other respects. With this division in mind Mr. C. W. Johnson 

 was asked to furnish data from the types of his species. Nemotelus immaculatus 

 is injured, but N. slossonae and flavicornis have the third vein simple. Although 

 these species have the abdomen white, it is nevertheless marked with a blackish 

 design. We shall look forward with interest for an account of this characteristic 

 in the other species. 



In the preparation of this paper I have had access to the Hough collection of 

 the University of Chicago. My own material supplemented by specimens from Dr. 

 Wm. M. Wheeler has been of the greatest use. In conclusion I wish to thank Mr. 

 Charles W. Johnson of Boston for his assistance in furnishing literature not access- 

 ible in Chicago and for the information regarding the types of his species. 



Key to the Species. 



Males : eyes contiguous, or nearly so ...... . 2. 



Females: eyes widely separated . . . . . . . . 17. 



2. Abdomen entirely black, or black with whitish marks ... 3. 

 Abdomen whitish or whitish with black markings . . . . n. 



3. Antennae situated at the middle of the short and blunt rostellum ; proboscis 



geniculate at its outer third, the outer part pilose ; eyes contiguous and 

 impressed along line of juncture ; third vein furcate ; black species with 

 golden pubescence ....... bruesii, sp. n. 



Antennae situated at base of the longer and more acute rostellum 4. 



4. Venter with a series of medial rufous spots ; legs beyond base of femora yel- 



lowish ; costal veins white ; greenish black species . . pallipes Say 



Venter immaculate ; hind legs at least in part blackened ; third longitudinal 



vein simple ........... 5. 



5. Body black, with no pale lateral markings on the thorax . . 6. 

 Thorax with pale lateral markings ....... 8. 



