278 



TEXT-ROOK OF ENTOMOLOGY 



from those of the Ichneumonidse in being not like crevices, but 

 circular openings. 



The distribution of the olfactory peg or tooth-like projections 

 seems to be much more limited than that of the pits in the Icli- 



fo r neumonidse. Hauser could not find any. 



i Apis mellijica possesses on each antennal 

 gt 



FIG. 280. Olfactory 

 pits of the antenna of 

 Bombus. After Krae- 

 pelin. 



FIG. 281. Olfactory pits of the antenna of Formica: 

 Fr, Hicks' "bottle," Fort-l's Ilask-shaped organ. />. 

 its opening. After Kraepelin. 



joint only about twenty slender pale teeth, scarcely a third as many 

 as in Vespa crabro; on the other hand, Formica, of which genus 

 several species were examined, seems to have far more teeth than 

 pits ; they are relatively long, pale, transparent, and somewhat 

 clavate ; they are not unlike those of Chrysopa ; on the terminal 

 joint only occur the round openings (Fvo), which lead into a bottle- 



FIG. 283. Vertical section through a sin- 



Fi. 282. Supposed olfactory organs 



at end of antenna of Catnpodea: .1. C. s \ e ^'fact'orv pit 'in'th.'Vi, lU-M'iia'oftVie'ho'rsi-ii'v 



staphyhnvs. , C. coote, from Mam- iTdbanwiovinus). For letu-rini,' soo p. >->. 



m/-ith t.Gvt* ^ . * 



moth Cave. 



-After llanscr. 



shaped invagination of the integument (Fv) and contain an olfactory 

 style (Fig. 281). In the Tenthredinidse only teeth and no pits were to 

 be detected. Sirex has on the under side of the nine last joints of each 

 antenna a group of from 200 to 300 small teeth, which resemble 

 those of Vespa crabro; Lyda has on the terminal joints about 100 



