REVISION OF BORARIA AND GYALOSTETHUS — HOFFMAN 315 



Genus Boraria Chamberlin 



Aporiaria (part) Chamberlain, 1939, p. 6. 



Boraria Chamberlin, 1943b, p. 143. — Chamberlin and Hoffman, 1958, p. 22. 

 Howellaria Hoffman, 1950, p. 26. — Chamberlin and Hoffman, 1958, p. 37. [New 

 synonymy.] 



Type species. — Boraria: Aporiaria Carolina Chamberlin, 1939, by 

 original designation; Howellaria: Aporiaria deturkiana Causey, 1942, 

 by original designation. 



Diagnosis. — A genus of small to moderate-sized xystodesmids with 

 the following characteristics: 



Body composed of head and 20 segments in both sexes; small to 

 moderate in size, slender to moderately robust, the W/L ratio varying 

 from 17 to 23% among the 3 species. Head of normal proportions, 

 smooth, with the usual facial setae present; genae with median im- 

 pression, or, in 1 species, the impression is continuous laterally to 

 the margin; antennae long and slender, separated by a broad isthmus. 

 Epicranial suture distinct; ventrally bifid in 2 species. 



Body segments generally smooth and polished, metatergites with 

 several transverse rows of small tubercules in 1 species, prozonites 

 and metazonites of about the same diameter, meeting at a shallow 

 interzonal stricture dorsally. Paranota subhorizontal to strongly de- 

 pressed, the posterior corners rounded on anterior segments, becoming 

 acutely produced only on the last 4 or 5 segments; scapulorae sub- 

 marginal; pores large, dorsolateral, in large depressions on the 

 broadened, flat peritremata; pore formula normal. 



Posterior segments normal in form, segment 20 sometimes slightly 

 telescoped but about average in size for xystodesmids; hypoproct 

 large, smooth, with or without a prominent median projection. 



Sterna broad, the legs widely separated; sternum of metazonites 

 scarcely modified, only slightly elevated at bases of legs, no tendency 

 for development of subcoxal spines or paramedian lobation; surface 

 smooth and glabrous. 



Legs moderately long and slender; coxae unspined except in 1 

 species where provided with prominent ventrally directed, acute distal 

 spines; prefemora with small, short distal spines. Pretarsi of normal 

 size and shape; sHghtly curved, compressed, without dorsal carinae, 

 about % as long as tarsi. Sides of segments smooth and polished, 

 unmodified. Anterior and posterior stigmata of about same size 

 and shape, subovoid or pyriform, largest dorsally, not rimmed or 

 auriculate. 



Sterna and legs of anterior segments of males without special 

 processes or other modifications except low paramedian knobs between 



