112 U.S. NATIONAL MUSEUM BULLETIN 261 



each ocellus, with a shallow median fovea which is narrowed anteriorly ; 

 antennal ledges not foveate, not carinate dorsally; face sparsely 

 pubescent below; clypellus pi'oduced, the contour of its lower half at 

 right angle to profile of clypeus; otherwise as in Aulacizes. 



Thorax with pronotal width greater than transocular width of head, 

 lateral margins convergent anteriorly, posterior t^vo-thirds of disc 

 transversely rugose, posterior margin slightly concave; scutellum trans- 

 versely rugose on posterior portion; otherwise as in Aulacizes. Forewing 

 with membrane not sharply delimited, clavus ver^' sparsely punctate, 

 other characters as in Aulacizes. Hindwing and hindlegs as in Aulacizes. 



Male genitalia: Pygofer not strongly produced posteriorly, its 

 posterior margin usually truncate, occasionally convex, with dispersed 

 microsetae on disc, with a slender process arising at apex of dorsal 

 margin, extending anteroventrally or posteroventrally. Plates fused 

 basally, tubular, their length variable interspecifically in relation to 

 pygofer apex, with dispersed microsetae. Style extending farther pos- 

 teriorly than apex of connective, with or without a preapical lobe, 

 truncate or pointed at apex. Connective Y-shaped with arms not 

 widely divergent. Aedeagus slender, symmetrical, with shaft usually 

 membranous apically, usually with a ventral process arising anteapically. 

 Paraphyses absent. 



Female abdominal sternum VII, where known, with posterior 

 margin broadly concave and with a slight median projection within 

 the concavity. 



Species of Amblydisca are known from Mexico, Guatemala, Costa 

 Rica, and Nicaragua. The genus is related to Aulacizes but differs in its 

 shorter pygofer processes, which arise dorsoapically, its basally fused 

 male plates, and its shorter head bearing a median fovea that is 

 narrowed anteriorly, as well as in other characters. The ventral aedeagal 

 process is somewhat variable in the type-species. The form of the aedeagal 

 shaft in caudoventral aspect is apparently a more reliable specific 

 character, but it also exhibits some variability within species. 



The present interpretation of Amblydisca rubrivenlris (Signoret) is 

 based on a comparison of the genitalia of the male lectotype with 

 figures 105b, e-g. The lectotype of A. stellaris (Walker) was found to 

 have closely similar male genitalia. 



A. tapes Fowler is placed in synonymy under A. multiguttata (Stal) 

 as a result of a comparison of external characters of the male lectotype 

 of ^. tapes with the illustration of the female lectotype of the Stal species. 



SPECIES OF AMBLYDISCA 



major, new species. Mexico, Nicaragua. 



multiguttata (StM), 1864a:80 {Aulacizes). S. Mexico, Mexico, Guatemala. 

 New combination. 



