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PROCEEDINGS OF THE NATIONAL MUSEU2M. 



VOL. 63, 



with a small sensory pit; antennal fossae deep and pronounced, the 

 lower margin projecting beyond the upper and not so deeply notched. 

 Near the posterior margin of the head is a transverse row of about 

 20 short dorsal setae. Slightly posterior of each temporal angle 

 is a large seta, the largest on the head. Prothorax about two-thirds 

 as broad as head and subdiamond-shaped, the lateral corners being 

 rounded. Mesothorax fully twice as broad as long and intermediate 

 in width between the head and prothorax, Metathorax broader than 

 long, about as broad as head, and broadest at posterior margin. 

 Abdomen almost twice as broad as long, the eight segments of al- 

 most equal length. Each of the first six segments of the abdomen 

 with two transverse rows of small, subequal setae, the number of 



Fir,. 0. — Gyropds ovalis. Dorsai* view of head. 



setae in the posterior row being approximately twice that of the 

 anterior row ; seventh segment with the two transverse rows of dorsal 

 setae, but their number is approximately equal in the two rows; 

 last segment without transverse rows of setae but with two pairs 

 of very long terminal setae. A single large pair of lateral setae 

 to each abdominal segment. They increase in length with the back- 

 ward sequence of segments. Gonopods semicircular in outline and 

 scooplike and not as they are usually figured; each extends dorsally 

 and inward, the inner dorsal margins extending beyond the pos- 

 terior end of segment VIII. Each gonopod has its rim fringed 

 with about a dozen setae; the two most ventral are minute, as also 

 are the two most dorsal, while the intervening setae are large and 

 increase in length toward the middle. Gential armature of male 



