40 rOWA ACADF.MV OF ;;crKN"CF.s:. 



sctile, while the me,s-ofhoraru- autl mefaflioracic seginents rtro- 

 contracted and thicker. The uiukjo i.ssue!> from a coiiipound 

 fissure on the dorsal surface, one limb of which is transverse- 

 and h>^"it(*d o\ cr the thorax; the other arises from the me- 

 dian point of this fissure and extends- anteriorly to the ceph- 

 alic m ir^-in. Fresh inwfjos when suJ)je('ted to slii>-ht })res- 

 sure, as under the c(>ver g'lass when inormtt'd in balsant, have 

 an extensive protrusion of the pleural fold oai the piXitlioroT 

 and abdomen corresponding' tothe^ lol>os of these parts in the 

 pupa. The iDMfjo does not accjuire its farinose character un- 

 til some hours after emergence. The extension of the jjleund, 

 fold on all but the wing* bearing segnnents of the body sug- 

 gests some interesting- inferences on the origin of these organs 

 (in Aleyro'Jes, at least), and it is h(>[)ed that more thorough 

 study of the material in hand will furnish some Ixasis for con- 

 elusions. 



THE HEMIPTEROUS FAUNA OF IOWA» 



BY I'ROF. HERBRKT OSRORX. 



{.■Jl>s/r,trt} 



Xo attemi){ at a catalogue of the insects of this order has- 

 yet been made, and though for several years attention lia.s^ 

 been given by the author to g-athering material for such a 

 catalogue, many of the families are as yet certainly very in- 

 complete. The following groups are represented : 



lieteroptcru ., twenty-one families, as follows: SfutfUerida>. 

 two g'enera, two species; C(>ri)iiela'nvla% one genus, three 

 species; CydiiMm^ two genera, two species; Penfafomrlce, sev- 

 enteen genera, twenty-six species; Cotr/rhc, eight gxMiera, 

 twelve species; Iteryfrhv^ three genera, four species; Li/ga'- 

 ida% seventeen g-enera, nineteen species; Capsi'hc, twelve 

 genera, fourteen s[)ecies; AcantliHcc, two genera, two s|)e- 

 cies; Tingifida'., two genera, three species; Aradidm, one 



