USED IX ENTOMOLOGY. [25 



Sinuato-lobate: sinuate and lobed. 



Sinuato-truncate: truncated, with the margin sinuate. 



Sinuous: undulating; curved in and out. 



Sinus: a curvilinear indentation more or less profound: an excavation as if 



scooped out : a curved break in an otherwise straight margin. 

 Siphon: a tube-like mouth organ in certain insects: the breathing tube of a 



Culicid larva : any tubular external process or structure. 

 Siphonaptera: an ordinal name for insects which are wingless: mouth formed 



for piercing and sucking; saltatorial ; transformations complete: the fleas: 



= Aphanipter a ; q. v. 

 Siphonata: = Homoptera or, more specifically, plant lice and leaf hoppers. 

 Siphonets: see honey tubes. 



Siphonophora: = Coccinellidae ; the term is preoccupied in the Ccelenterates. 

 Siphunculata: the sucking lice. 

 Siphunculus: the suctorial organ of a louse, contained within the tubule: 



in plant lice =honey tubes ; q. v. 

 Situ (in) : in its natural place or position. 



Sixth longitudinal vein: in Diptera; = 1st anal vein (Comst.). 

 Skeleton: the hard chitinous parts which externally (exoskeleton) or in- 

 ternally ( endoskeleton) form a protective covering, or serve as points of 



attachment, to muscles and other soft organs. 

 Skippers: a popular term for Hesperid butterflies: the dipterous larvae some- 

 times found in cheese and other provisions. 

 Slaty: very dark blackish gray with a reddish tinge [neutral with a little 



Indian red]. 

 Slug: in general, any larva that has a slimy viscid appearance, and the body 



closely applied to the food plant : more specifically, the larvae of certain 



saw-flies and of some Coleoptcra. 

 S. M. interspace: sub-median interspace in the primaries of Lcpidoptcra, in-' 



eludes the space between the median and sub-median veins; (cubitus and 



1st anal, Comst.). 

 Smaltinus: a dull grayish blue. 

 Smaragdinus: emerald green [pale green]. 

 Smooth: a surface without elevations or indentations. 

 Snout: the prolongation of the head in Rhynchophora at the end of which the 



mouth parts are situated : see rostrum. 

 Social: living in communities: more especially those species in which unde- 



veloped or worker forms occur and where the colony has a single female 



head. 

 Soldiers: in termites; forms sexually undeveloped, in which the mandibles 



are pincer-like and the head is much enlarged : worker majors in certain ants. 

 Solid: applied to an organ usually jointed, when these joints form into one 



mass ; e. g., the capitulum of certain clavate antennae. 

 Solitary -arius: occurring singly or in pairs; not in colonies. 

 Somatic: relating to the body, or abdomen. 



Somatotheca: that part of pupa covering abdominal rings: = gasterotheca. 

 Somite: = arthromere. 



