76 



SAllTHSUNJAN MISCELLANEOUS COl-f.ECTIONS 



VOL. 8 1 



The stipes is usually marked by a prominent groove parallel to its 

 inner edge (fig. 25 A, q), setting off a narrow marginal strip. The 

 groove is here likewrise but the external line of an internal ridge or 

 plate upon vi'hich are inserted the adductor muscles of the stipes 

 ( B, KLst) . Crampton designates the area of the stipes external to 

 the ridge as the " verastipes," and that mesad to it as the " juxta- 

 stipes." In Hctcrojapyx the basal part of the stipes is .strengthened 

 l)y an internal ridge (fig. 30 A, u) that forks proximally to the ends 

 of the hinge line with the cardo. 



Fjg. 31. — Maxillae of insects and of a chilopod. 



A, maxilla of Ncsoiiiachilis. B, maxilla of Tlicniiobia (Lepismatidae). C, 

 maxilla of larva of Sialis. D, terminal part of maxilla of Hctcrojapyx. V., 

 maxilla of an adnlt stonefly (Pteroiiarcys). F, first maxillae of a chilopod 

 (Litliobiiis). 



Base of palpus to be identified by insertions of levato'" and depressor mnscles 

 (O, Q) ; the palpifer (Plf) has no muscles, and appears as a mere subdivision 

 of stipes; in Sialis larva (C). lobe is not the galea, but an endite of first 

 segment of palpus {iplp), the latter identified by its muscles (O, (J). 



The ventral, or distal, end of the stipes bears the lacinia and galea, 

 and to its lateral surface is attached the palpus. The lacinia and galea 

 are movable lobes, each being jirovided with muscles having their 

 origin in the stipes, by which they can be fiexed posteriorly (or ven- 

 trally if the mouth appendages are horizontal). The lacinia, in ad- 

 dition, has a muscle from the cranial wall inserted on the iinier angle 

 of its base, which gives it a mesal fiection, or adduction. The base of 

 the galea commonly overlaps anteriorly the base of the lacinia. 



The maxillary palpus arises from the outer wall of the stipes, 

 usually only a short distance proximal to the base of the galea. The 



