\\i> 





Among ants of the tame the different 



in the number of lateral fat etS. Thu- in lorm'u <i fr,itfn^i^. aO 



Forel. the worker ha- about ooo faeet- in ea< h < \c. the queenSoo-QOO 



and the male i .200. 



Blind Insects. Manx laiV*, -urroundcd by an abund food 



and living often in darkne . need no eye- and ha-. 



the dipterou- "maggots" and many other -e<lrntary I. 'li< ularly 



such as are internal parasite^ I at hinida-. Ichncumonida 

 feed within the ti many Bupre-ti<: 



Cun ulioni(he). Subterranean or cavemicoloufl in re either 



cycle-- or else their eyes are mon according to the 



amount of light to which they have 



-s. The statement is made that 

 blind insects never have functional 

 w i 1 1 . 



Antennae. The antennae, never 

 more than a single pair (though 

 embryonic "second antennae "occur 

 in Thysanura and Collembola), are 

 situated near the compound eyes and 

 frequently between them. With rare 



ptions the antennae have always 



ral and usually many segments. 

 In form these organs are exceedingly 

 varied, though many of them may 

 be referred to the types represented FlG - 

 in Figs. 42-44. 



Though homologous in all insects, the antennae are by no means equiv- 

 alent in function. They are commonly tactile (grasshoppers, etc.) or 

 olfactory (beetles, moths) and occasionally auditory (mosquito), as 

 described beyond, but may be adapted for other than sensory functions. 

 Thus the antennae of the aquatic beetle Ilydrophilus are used in connec- 

 tion with re-piration and those of the male Mcloe to hold the female. 

 Sexual Differences in Antennae.- In moths of the family Saturniida- 

 rrof)i<j. C. promcthea, etc.) the pectinate antenna- of the male are 

 : and more feathered than those of the female, and differ a 

 having more segments (Fig. 43). Here the antenna- are chieily olfac- 

 and the reason for their greater development in the male appears 

 from the fact that the male seeks out the female by means of the 



ell and dejH-nds upon his antenna' to peneive the odor emanating 

 from the opposite 



43- Antennae of a rtioth. Samia 

 cecropia. A, male; B, female. 



