Pomona College Journal of Entomology 



787 



each side pinkish ainl)er, four on ventral surface lilack, portion connecting 

 coxae pink. Metathorax — Muscle lobe dark amber, remainder lighter, ventral 

 surface dark around eoxaj with a light hand connecting them. Abdomen — 

 Distinctly segmented, the lateral margin of each segment with a distinct 

 tubercle (Figure 250, 5) shorter than those on the prothorax and a dark blotch 

 around each tubercle, also with a transverse median brown band whicli may 

 or may not be in two parts, and a spot between the segments near the lateral 

 margins as shown in the drawing. Entire surface may be covered with a fine 



Figure 249. Melanoxantherium rufulus (Davidson) 



A, winged viviparous female; B, apterous viviparous female; C, cornicle of winged 



female; D, cornicle of apterous female. 



white powder, which is usually thickest between the segments. Anal plate 

 large, hairy, amber. Cornicles— (Figure 249 C). Vasiform, very narrow 

 throughout the basal half and enlarged and contracted in the apical half so 

 that the mouth is wider than the base but much narrower than the widest 

 part, contracted just before the mouth, which is flaring, yellow or orange 

 throughout, with often a dusky tip ; length 0.38 mm., width at base 0.05 mm., 

 width at narrowest place 0.04 mm., width at widest place 0.08 mm., width of 

 contraction just before the mouth 0.45 mm., width of mouth 0.06 mm. Legs — 

 Stout, hairy; front legs much shorter than the rest, middle legs longer than 



