4 Psyche [February 



5. First and fourth segments of antennae incrassated 



Microphyilia Stal 

 First and fourth segments of antennae not incrassated 6 



6. Width of dilation of posterior tibise less than width across 



elytra Stenoscelidea Hope. 



Width of dilation of posterior tibise greater than width across 

 elytra 7 



7. Length of basal joint of antennae less than twice the length of 



head Diactor Perty. 



Length of basal joint of antennae at least twice the length of 

 head Anisoscelis Latr. 



8. Second segment of antennae dilated, third also dilated 9 



Second segment of antennae simple, third dilated, Baldiis Stal 



9. Second segment of antennae dilated on both sides 



Chrondrocera Lap. 



Second segment of antennae slightly dilated above, not below, 10 



10. Posterior lateral angles of thorax produced, or sharply angled 



Holymenia Stal 



Posterior lateral angles of thorax not at all produced 



Tarpeius Stal 



A PHYLOGENETIC STUDY OF THE TERGA AND WING 



BASES IN EMBIIDS, PLECOPTERA, DERMAPTERA, 



AND COLEOPTERA.i 



By G. C. Crampton, Ph.D., 

 Massachusetts Agricultural College, Amherst, Mass. 



In a previous paper, the Plecoptera, Embiids, Hemimerids, and 

 Dermaptera, were grouped in a superorder called the Panplecop- 

 tera, and a further study would indicate that the Coleoptera might 

 be included in this group also. There is some doubt as to the 

 Strepsiptera, but certain features point to a rather close relation- 

 ship between them and the Coleoptera (as is generally thought to 

 be the case, although the investigations of Pierce, 1909, have 

 thrown some doubt upon the current idea of their affinities) and it 

 is quite possible that the Strepsiptera should likewise be included 

 in the superorder mentioned above. 



> Contribution from the Entomological Laboratory of the Massachusetts Agricultural College, 

 Amherst, Mass. 



