USED IN ENTOMOLOGY. 125 



Sinuato-lobate: sinuate and lobed. 



Sinuato-truncate: truncated, with the margin sinuate. 



Sinuous: undulating; curved in and out. 



Simus: 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 : = Aphaniptera ; q. v. 



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



Siphonets: see honey tubes. 



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



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, = ist 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 Coleoptera. 



S. M. interspace: submedian interspace in the primaries of Lepidoptera, 

 includes the space between the median and submedian 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. 



