318 U. S. NATIONAL MUSEUM BULLETIN 216 pabt 3 



three Mexican collections reported above were made June 6, "August," 

 and October 16. 



This species is known from the Carolinian fauna and from Mexico. 



III. MOERENS GROUP 



Lower half of frons smooth, without grooves, wrinkles, or carinae; 

 upper tooth of mandible about the same length as lower tooth; notau- 

 lus not sharp, rather short ; mesopleurum with very fine close punctiu-es, 

 without any wrinkles or coarse punctures; basal transverse carina of 

 propodeum complete and strong; apical transverse carina of pro- 

 podeum represented by a pair of well separated tubercles ; first tergite 

 of female unusually slender, without a dorsolateral longitudinal 

 carina, its spiracle far from apex. 



This group occurs in southern South America. It includes Cryptus 

 dimidiatus Taschenberg 1876, Alomya moerens Perty 1833, and an 

 undescribed species from Argentina. The names dimidiatum and 

 moerens have not previously been referred to Joppidium (new combi- 

 nations). Synonyms of moerens (all new) are: Cryptus violaceipennis 

 Brulle 1846, Opisosextus (!) concolor Szepligeti 1916, 0. incompletus 

 Szepligeti 1916, and Isocryptus azureus Brethes 1927. 



15. Genus Hidryta 



Figure 315, b 



Hidryta Foerster, 1868, Verh. Naturh. Ver. Rheinlande, vol. 25, p. 187. Type: 

 (Brachycryptus erythrocerus Thomson) = frater (Cresson); designated by 

 Viereck, 1914. 



Brachycryptus Thomson, 1873, Opuscula entomologica, fasc. 5, p. 487. Type: 

 {Brachycryptus erythrocerus Thomson) = frater (Cresson) ; designated by 

 Viereck, 1914. 



Euthycryptus Jussel, 1907, Beitrage zum 50 jahrigen Bestande zugleich 44. 

 Jahresbericht iiber das Jahr 1906, Voralberger Landesmuseum, Bregrenz, 

 p. 71. New synonymy. Type: Euthycryptus scrobiculifer Jussel; monobasic. 



Front wing 3.1 to 5.6 mm. long; frons unarmed; clypeus small, 

 rather weakly convex, its apex broadly truncate or wealdy arcuate, 

 without a median tooth; thorax rather short, fii'st abdominal segment 

 long, and rest of abdomen short, the fu"st abdominal segment 0.55 to 

 0.70 as long as thorax; mesoscutum short, rather wealdy convex, 

 polished or subpolished, its punctures moderately coarse, separated 

 by about their diameter; notaulus sharp, reaching at least to center 

 of mesoscutum; epomia weak or absent; prepectal carina reaching 

 dorsad to subtegular ridge; prepectus without a short vertical carina 

 opposite lower corner of pronotum; propodeum in profile weakly con- 

 vex, strongly sloping, its basal carina complete, its apical carina 

 complete or interrupted medially, forming weak sublateral crests; 

 propodeal spiracle circular; areolet moderately large, pentagonal, its 



