224 
Psyche 
[September 
1.201.35 mm.; mean (17 exx.) 1.30 mm. Body proportions are 
quite constant: LP/WP, 0.88-0.91; WF/WH, 0.76-0.80. 
Distribution. II. acapulcana is known only from the type series 
and one additional, dissected specimen from Acapulco, Guerrero, 
Mexico. Its name is derived from the type locality. Although 
no specific data are available, acapulcana is very probably an inhabi- 
tant of the coast, and may be intertidal. 
Ilalocoryza arenaria (Darlington), new combination 
Schizogenius arenarius Darlington 1939:84. Type locality — Rio Yaque del 
Sur, near Barahona, Dominican Republic; holotype in the Museum of 
Comparative Zoology, M. C. Z. Type No. 23,505, examined. Blackwelder 
1944:27. 
With the characters of the genus (see fig. 2) ; color dark testaceus. 
Larger than H. acapulcana — LE, 1.35- 1.45 mm.; mean (5 exx.), 
1.39 mm. Sixth frontal carina of head extended unbroken onto frontal 
lobe. Eyes small (WF/WH, 0.76-0.80), flat, coarsely faceted, the 
facets all equal in size. Posterior supraorbital seta placed behind and 
nearly in line with the abbreviated fourth frontal carina. Lacinia 
appearing quadridentate, the abruptly bent apex preceded in line by 
three pairs of stout, crossed setae. Gula at narrowest point approxi- 
mately 0.48 width of mentum. Pronotum usually slightly elongate 
(LP/WP, 0.97-1.06). Paramedian and paralateral sulci shallow, 
but not as inconspicuous as in acapulcana . Median sulcus, except 
basally, closely bordered by a pair of sharply elevated carinae which 
are most widely separated just before apex; interspace at widest point 
more than 0.10 WP. Anterior transverse impression faintly punctate. 
Elytral interval three with twelve or thirteen regularly spaced seti- 
gerous punctures placed near the inner striae. Penultimate tooth of 
front tibia with seta submedian. Tarsi very short (Ta/Ti, approxi- 
mately 0.55). Sternum two with paramedian carinae usually well 
developed. Median lobe of male genitalia (fig. 4) with apex strongly 
produced, broadly truncate in lateral view; basal diameter of median 
lobe 0.41 ventral length. Internal sac with elongate basal sclerites, 
otherwise lacking distinct sclerites or spines; apical brush large but 
not heavily sclerotized, lacking enlarged seta-like plates dorso-apically. 
Distribution. I have seen six specimens of H. arenaria f from two 
localities in the West Indies: Barahona, Dominican Republic 
(Holotype) ; and Rio Piedras, Puerto Rico (one male and three 
females in the Museum of Comparative Zoology, and one female in 
my collection). In addition, one other specimen from the same 
