4 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 124 



Spur of anterior tibiae heavier and straight. Femora less shining 

 than in male, covered with thin argillaceous coating. Terminal and 

 penultimate abdominal segments of equal length, with cream-colored 

 argillaceous coating covering half their length along their common 

 margin. 



Types. — Holotype: collected at light, El Salvador, San Salvador, 

 May 1, 1957, by P. A. Berry, USNM 69609. Allotype: Mexico, Sinaloa, 

 27 miles east of Villa Union, July 7, 1964, H. F. Howden (Canadian 

 National Collection). Paratypes, 6 females: 3, El Salvador, San Sal- 

 vador, May 1, 1957, P. A. Berry, at light; 1, Mexico, Veracruz, Cuit- 

 lahuac, Aug. 10-12, 1964, Paul J. Spangler; 1, Mexico, Veracruz, 18 

 miles north of San Andres, June 1954, D. G. Kissinger; 1, Guatemala, 

 Suchitepequez, Cuyotenango, Olimpo, Finca San Rafael, Jan. 21, 1956, 

 J. M. Campbell, ex large detritus cavity of Atta cephalotes (L.), 6-8 

 feet deep (Canadian National Collection). 



Remarks. — This species usually shows no argillaceous coating on 

 the elytral costae; however, the allotype does show a very fine line of 

 this coating along each side of the costae — one of the reasons the 

 specimen was chosen as allotype. It was also the best of the female 

 specimens available. 



The species is named in honor of Dr. Federico Islas S. of Mexico 

 City, who described the genus and first species of this interesting and 

 unusual group of myrmecophilous scarabs. 



Carltvrightia cartwrighti, new species 



Plate 2 



Holotype male. — Length 3.0 mm, width 1.25 mm. Elongate, sub- 

 parallel; except for smooth black elytral intervals, completely covered, 

 including legs and underside, with grayish-brown argillaceous coating. 

 Clypeus with double anterior edge, upper and lower margins separated 

 by fine narrow furrow extending from gena to gena, lower margin 

 with median triangular tooth directed downward; upper margin an- 

 teriorly narrowly shining brown, very narrowly recurved, shallowly 

 emarginate between two low, widely spaced angles, straight laterally 

 to genal angles; genae at middle notched or angulate inward, leaving 

 sharp angle posteriorly; posterior margin of clypeus sharply elevated 

 above frontal-basal area of head and down laterally to genae; fine fur- 

 row ending in pit anteriorly behind gena, furrow just in front of fine 

 carinaform margin following curvature of eye; clypeus with strong 

 median longitudinal swelling over middle third, surface argillaceous 

 with some masked, close moderate punctures on each side of median 

 swelling separated by one diameter or less, elsewhere with fine indis- 

 tinct punctures. 



