REVISION OF STREPSIPTEEA PIERCE. 199 



Maternal host.— The adult insect sheltering the mature female; used in distinguishing 

 between the host at the time of birth of the triungulinid and the larva which it is 

 about to attack and make its permanent host. 



Maxilla;. — The second pair of organs of the mouth. 



Maxillary analogue. — See Analogue. 



Mesostigmatal lobe.— A lobate organ, arising from the mesopleime and protecting the 

 mesostigmatal pore. 



Mrta pleura. —A narrow side piece bordering the scutum and behind the wings. 



Molt.— The perfect or imperfect casting of the skin, or the complete separation but 

 persistence of an immature skin. See Female, Persistent larval skins, Persistent 

 pupa, Puparium. The molt is the act which separates the instars and stages. 



N. 



Nest.— The habitat of paper making, social Hymenoptera. 



Ninth abdominal segment .—That elongate terminal segment of the male abdomen 

 apically bearing the genital armature and basally overhung by the tenth seg- 

 ment. See Hypopygium, (Edeagus. 



0. 



Occiput.— The narrow ventral band at the base of the head and limiting the buccal 

 cavity. 



(Edeagus.— The tubelike sheath of the penis, arising at the apex of the ninth or termi- 

 nal segment of the abdomen. See Paramera, Penis. 



Oligotropic— Refers to insects which visit a single species or genus of flowers, or 

 sometimes to those which are confined to a single family of flowers. 



Ommalidium.—A single facet of the eye, each being separated by a ciliate wall. 



Osmosis surface.— Any surface of the body through which vigorous osmotic ingestion 

 takes place. 



Osmotic ingestion.— Obtaining food or nourishment through portions of the body at 

 the expense of the vital organs of the host. 



P. 



Pedogenesis— The production of young by immature parents. 



Palpus, maxillary.— The second joint of the second pair of organs of the mouth. 



Paramera.— The sheaths of the penis, together forming the cedeagus. In Strepsiptera 

 they are fused throughout. 



Parapleura.—A narrow side piece to which the wing is attached; it lies below the 

 metapleura. 



Parasitic larvx.— All instars of the larval period after the entrance into the permanent 

 host. 



Penis.— A very slender tube contained within the cedeagus and which may be exserted 

 through a pore in the latter. 



Permanent host.— The host which harbors the strepsipteran from triungulinid until 

 maturity. 



Persistent larval skins.— The unshed larval skins which conceal the male pupa and 

 form the pupa case or puparium. 



Persistent pupa.— The stage of female maturity in which the adult remains hidden by 

 its pupal skin until death. 



Pharynx.— This organ, as the writer interprets it, is composed not only of the lining of 

 the narrow opening near the front of the buccal cavity, but of the entire lining of 

 the cavity, bounded by epicranium, gense, and occiput. The lining of the 

 pharynx is soft and evidently sensitive and forms, as it were, a broad surface, 

 elevated crater-like in the middle and there constricted into a narrow tube. The 

 clypeus, if present, is fused, and the labrum and labium are absent. 



