ANATOMY OF MARELLIA REMIPKS — CARBONELL 85 



angular excision in its apical part (see fig. i6). Its whole upper sur- 

 face, especially at the edges of the depression where the ovipositor is 

 located, is densely covered by long, light-colored hairs. This pilosity 

 again suggests a hydro fugous structure that may be related to ovi- 

 position. For the sake of clarity the hairs have been omitted in the 

 illustrations. 



The epiproct of the female (figs. i6 B, 17 A, Eppt) is roughly 

 rhomboidal in shape and shows a distinct Y-shaped sulcus on its upper 

 surface, with its branches diverging anteriorly. The paraprocts {Ppt) 

 are slightly shorter than the epiproct. 



The ovipositor. — The general structure of the ovipositor can be 

 observed in figures 16 B and 17. The usual elements of the acridoid 

 ovipositor can be easily recognized in it, but their shapes are here 

 strongly modified. 



The first or ventral valvulae (fig. 17 B, C, iVl) are the strongest 

 of the valvulae and constitute the most conspicuous part of the ovi- 

 positor. Their shape is most unusual : they present a basal, laterally 

 expanded lobe (figs. 16 A, 17 B, iVl'), and a distal, apical part 

 (fig. 17, iVl). The basal lobe is armed with a row of stiff bristles 

 on its upper lateral margins, and it is the only part of the first valvulae 

 that can be seen in a dorsal view (fig. 16, iVl'). The apical parts of 

 the first valvulae (fig. 17, iVl) are narrow and have a linear series 

 of stiff bristles directed upward and curved rearward on their dorsal 

 surfaces (figured only in fig. 17 B). The external upper edges of the 

 dorsal surface of these distal lobes and the external surface of their 

 apices are distinctly denticulate. The basal, laterally expanded lobes 

 of the first valvulae might represent the lateral basi valvular sclerites 

 described by Snodgrass (1935a) in the first valvulae of the ovipositor 

 of Dissosteira, but in order to ascertain this, a study of the muscles 

 would be necessary. If they do represent the basivalvular sclerites, 

 these sclerites are in Mar cilia united to the rest of the valvula in a 

 continuously sclerotized structure. 



The second valvulae (fig. 17 C, 2VI) are a pair of slender, pointed 

 lobes arising between the bases of the first and third valvulae. They 

 are similar in shape to those of Dissosteira. 



The upper or third valvulae (figs. 16 B, 17, jF/) are, like the first, 

 of a most unusual shape. They are very long and slender, their apical 

 portions decurved, with a somewhat excavated upper surface. Even 

 from above (fig, 16 B, jF/) the tips of these valvulae are somewhat 

 expanded laterally or spatulate, and their edges and apices are dis- 

 tinctly granulated. In an upper view of the female abdomen, the tips 

 of the third valvulae cover the apical lobee of the first ones which lie 



