138 EXPLANATION OF TERMS 



Telescopic: arranged so that one portion of an organ or process may be 

 drawn into another, like the joints of a telescope. 



Telson: a terminal tubercle bearing the anal opening: the anal segment of 

 the insect embryo. 



Telum: a spear, or spear-shaped process. 



Temple: the posterior part of the gena ; behind, before or beneath the eye. 



Tempora: the temples. 



Temporal margins: in Mallophaga, the lateral margins of the hind head. 



Tenaculum: in Collcmbola, a small organ which holds the furcula in position 

 when at rest : = catch. 



Tenant hair: see tenent hair. 



Tendo: the anal area of secondaries when it forms a groove for the ab- 

 domen : has also been called f renum and f renulum : in Trichoptcra, a small 

 elliptical space at base of hind wings near base of anal veins and behind 

 the trochlea. 



Tendon: the slender, chitinous plates, bands, strap- or cup-shaped pieces, to 

 which muscles are attached for moving appendages : see apodeme. 



Tenent hair: specialized hair adapted for clinging or clasping. 



Teneral: that state of the imago just after its exclusion from pupa or 

 nymph, in which neither coloring nor clothing is fully developed. 



Tensor: a muscle which stretches a membrane. 



Tentacle: a flexible sensory or tactile process; in some cases retractile: usu- 

 ally prefixed by a descriptive term indicating the structure to which it is 

 attached. 



Tentacula -um: retractile processes on the larvae of Lcpidoptera. 



Tentaculate: a margin when fringed with soft tactile processes. 



Tentiform: shaped like a tent: see mines. 



Tentoria: Dipt era; two hollow, cylindrical struts which pass from the ven- 

 tral border of the occipital foramen to the cheeks. 



Tentorium: a chitinous framework within the head, upon which the brain 

 rests. 



Tenuis: thin, slender; long drawn out. 



Terebra: a borer or piercer: an ovipositor fitted for boring or cutting as in 

 saw-flies : a mandibular sclerite articulated to the basalis ; forms the point 

 of the structure and = the galea of the maxilla. 



Terebrant: with an ovipositor fitted for piercing or boring. 



Terebrantia: Hymcnoptcra with sessile abdomen and valved ovipositors: 

 Thripids in which the ovipositor of female is borer-like. 



Teres, Terete: cylindric or nearly so. 



Tergal: belonging to the primitively upper surface: see dorsal. 



Tergal suture: the Y-shaped dorsal suture on the head of many insect larvae. 



Tergite: the primitively dorsal part of a segment, especially when that part 

 consists of a single sclerite ; usually applied to the abdomen. 



Tergo-pleural: the upper and lateral portion of a segment. 



Tergo-rhabdites: the lower pair of corneous appendages forming the ovi- 

 positor in grasshoppers : plates on the inner dorsal surface of the abdominal 

 wall. 



Tergum: the primitively upper or dorsal surface whether it consists of one 



