Hcbard — Dcnnaptcra and Orfhoptcra 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. 



hi 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) ^ B^Jq*^ 



1869. BI[atfa] sijiiilis Saussure, Mem. Soc. Phys. Nat. Geneve, 

 XX, p. 243. [ S , Australia ?] 



1895. Phyllodroniia obfusata Brunner, Proc. Zool. Soc. Lon- 

 don, 1895, P- ^9-- [ 5 , Kona, etc., Hawaii.] 



Kirby, in T904. first referred obtiisafa 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 obtiisata 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, MH, 8, 1919, (P. H. Timber- 

 lake), 5 <? , 19, [Timberlake Coll.]. 



Olaa District, Hawaii, 2500 feet, (W. H. Ashmead), 2$, 

 [U. S. N. M.] 



Ridge south of lao \"alley, West jMaui, 2000 feet, VH, 28, 

 1919, (P. H. Timberlake), i?, [Timberlake Coll.]. 



Mount Kaala, Oahu, 2500 feet, (P. H. Timberlake), i $ ; 

 (J. A. Kusche), iS, 2$, i juv., [Hebard Coll.]. 



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