Hebard—Dermaptera and Orthoptera of Hawaii 327 
Though widely different in certain features, the genus Eoblatta 
agrees so closely in other characters that it is clear the two are 
derived from a common ancestor, more recent than that connecting 
them with any of the known American forms. This phylum we 
believe should be placed at or near the end of the Ectobiinae, 
showing in numerous respects close convergence toward certain 
types developed in the Pseudomopinae. 
In recognizing the genus Allacta the following characters are, we be- 
lieve, of value. Form moderately broad; tegmina and wings showing some 
atrophy, not projecting beyond apex of abdomen, often showing some distal 
truncation and not fully so large in proportion to body bulk in female as in 
male; discoidal sectors of tegmina weakly oblique. Ventrocephalic margin 
of cephalic femora armed with a row of spines that are entirely piliform, 
terminating in two heavy, distal spines. Dorsal surface of male abdomen 
unspecialized, but conspicuously constricted in distal portion. Large pulvilli 
present on all four proximal tarsal joints. Arolia present between the sim- 
ple but strongly asymmetrical tarsal claws. 
Allacta similis (Saussure) 
1869. Bl{atta] similis Saussure, Mem. Soc. Phys. Nat. Geneve, 
DX p24. lad Australia’ | 
1895. Phyllodromia obtusata Brunner, Proc. Zodl. Soc. Lon- 
don, 1895, p. 892. [¢@, Kona, etc., Hawaii.] 
Kirby, in 1904, first referred obtusata to the genus Allacta, a 
decision that we believe to be fully warranted. After careful con- 
sideration of the literature, we feel compelled to place obtusata in 
synonymy under similis. Saussure’s description is unusually com- 
plete and no features are given by which the type can be separated 
from the Hawaiian material at hand. 
Kealakekua, Hawaii, 3000 feet, VIII, 8, 1919, (P. H. Timber- 
lake), 54, 19, [Timberlake Coll.]. 
Olaa’ District, Hawaii, 2500 feet, (W. H. Ashmead), 236, 
Ue S:N. M.] 
Ridge south of Iao Valley, West Maui, 2000 feet, VII, 28, 
1919, (P. H. Timberlake), 19, [Timberlake Coll.]. 
Mount Kaala, Oahu, 2500 feet, (P. H. Timberlake), 1 ¢ ; 
Cie -Avskusehe), 16, 2°23 1, juv.,, [Hebard Coll.]. 
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