98 EXPLANATION OF TERMS 



Pectoralis: relating to the breast. 



Pectoral plate: in Coleoptera, the sternum. 



Pectunculate: with a row of minute appendages like the teeth of a comb; 



e. g., some maxillary structures. 

 Pectus: the ventral portion of thorax: variably applied; in Coleoptera, for 



the entire meso- and metathorax ; also the pro- and mesosternum ; in 



Diptera, is the inferior surface of the thorax between the legs. 

 Pedal line: in caterpillars; extends along the base of the feet. 

 Pedal tubercle: on the thoracic and abdominal rings of caterpillars; on the 



anterior side of leg-base and, correspondingly, on apodal segments : is VII 



of the abdomen where it consists of three setae ; VI of the thorax where 



the setae are not numbered; constant (Dyar). 

 Pedamina: the aborted fore-legs of Nymphalid butterflies. 

 Pedate: foot-bearing, or having feet. 



Peddler: applied to the larvae of such Cassid beetles as carry their excre- 

 ment and cast skins on an anal fork. 

 Pedes: the feet, or really, legs. 

 Pedicellus or Pedicle: the third joint in a geniculate antenna; forming the 



pivot between scape and funicle : in general, a stalk or stem. 

 Pediculosis: a state of lousiness, or the abnormal condition caused by the 



multiplication of lice on the body : see phthiriasis. 

 Pediculous: lousy; infested with lice. 

 Pedigerous: feet-bearing. 

 Peduncle: a stalk or petiole: the basal joint of the antenna in Homoptera: 



the smaller of the two stalks supporting the mushroom body ; q. v. 

 Pedunculated: set on a stalk or peduncle: attached by a slender stalk or 



neck. 



Pelagic: inhabiting the sea, far from land. 

 Pellicles: the exuviae or cast larval skins of many insects: in Coccida more 



especially applied to the hardened larval skin attached to the puparia of 



Diaspina. 



Pellit: covered with long, drooping hairs, irregularly placed. 

 Pellucid: colored, but transparent: sometimes applied when there is no color. 

 Pelotons: the balls of fine tracheae in larva?, developed to supply the adult 



organism. 



Pelottae: = arolia ; q. v. 

 Peltate: shield- or target-shaped. 

 Penal claspers: in Proctytripidcc: lateral fringed processes of the male 



genitalia. 



Penal sheath: the horny outer covering of the penis. 

 Pencil: a little, elongated brush of hair: in Diptcra, applied to a group of 



sensory hairs on the flagellum of the antenna. 

 Pendent: hanging down. 



Pendulous: drooping; hanging free, attached to one end only. 

 Penes: open, slit-like structures of the seminal vesicles to the outer surface 



in Euplcctoptcra. 

 Penicillate: with a long, flexible brush or pencil of hair; often at the end 



of a thin stalk. 



