54 Journal New York Entomological Society. [v i. vin. 



4 — Prothorax as in Homceusa, the base transverse and Insinuate, the angles right, not 

 rounded and somewhat prominent, the sides arcuate and apical angles very 

 broadly rounded ; basal tergites as in Soliusa, not impressed at base ; eyes smaller 

 than usual, the antennae rather strongly incrassate, the tenth joint probably formed 

 by the fusion of two, but not relatively longer than in Homceusa ; infraocular 

 ridge fine but abruptly and strongly elevated, the additional ridges wanting ; 

 basal joint of the hind tarsi as long as the last and a little longer than the next 

 two combined ; pubescence moderate in length as in Homceusa ; [type expausa 

 Lee] Decusa, gen. nov. 



The type of Soliusa may be briefly described as follows : — 



Moderately stout and depressed, the head nearly three-fifths as wide as the prothorax, 

 with the eyes slightly prominent ; antenna but little longer than the width of the 

 body ; prothorax three-fourths wider than long, equal in width to the elytra and 

 distinctly shorter, the sides rotundato-convergent anteriorly ; abdomen at base 

 nearly as wide as the elytra, acuminate, the sides straight ; fifth tergite at apex 

 three-fifths as wide as the first ; color throughout pale brown, the abdomen a little 

 darker, the surface rather shining and quite feeble punctulate ; pubescence con- 

 spicuous but subdecumbent as usual. Length, 1.75 mm. ; width 0.63 mm. 

 New York crinitula, sp. nov. 



Individuals seem to be rare in all of these genera and probably have 

 throughout a more or less complete symbiosis with ants. Myrmobiota 

 crassicornis and Decusa expausa have both been sent to me by Mr. 

 Wickham as having been discovered in ant-nests. 



Mr. Wasmanti (Tijd. v. Ent. XLI), states that Myrmobiota Csy. 

 (Col. Not. V, p. 594) is identical with Homceusa Krtz., citing speci- 

 mens collected by Mr. Wickham and forwarded to him through Mr. 

 Schmitt. There is manifestly some mistake in identification, how- 

 ever, and my friend's remarks must refer to the species here described 

 under the name Soliusa crinitula or to one closely al- 

 lied thereto ; but if the latter surmise prove to be cor- 

 rect, I am forced to differ in opinion concerning the 

 status of that species, for a study of the basal tergites 

 of the abdomen, form of the mesosternum and thor- 

 acic base, and other characters, show that crinitula, 

 Fig. i.— Prothorax also, is generically distinct. In regard to Myrmobiota, 



of Myrmobiota and th£re ^ be nQ d()ubt Qf ^ ^^ isolation from ff . 



lloiiuritsti. 



mcvusa, as an inspection of the small accompanying 

 diagrams of the"prothorax will abundantly demonstrate, the upper 

 figure referring to Myrmobiota and the lower to Homemsa acuminata. 

 That Mr. Wasmann has fallen into an error in identification, is further- 

 more evident at once from his statement that crassicornis (Wasm. nee 



