REPORT OF THE STATE ENTOMOLOGIST 19007 260 
MAYETIOLA K ieft. 
This genus is of particular interest, as it includes the exceedingly 
| injurious wheat pest known as the Hessian fly, M. destructor 
Say. It comprises an assemblage of species which may be recog- 
nized by the third vein uniting with costa at or beyond the apex, in 
connection with the quadriarticulate palpi and simple claws. Plate 
_ 36, figure 6 illustrates a’ an ce form, possibly the representative of 
_ another genus. 
Key to species : 
_ 4 12 to 'I5 antennal segments 
| b 12 antennal segments 
: c¢ Abdomen yellowish; antennae light brown, the segments sub- 
sessile; male...... (Oligotrophus) azaleae Felt, C. 48 
bb 13 sessile or subsessile antennal segments 
Cr NDC omentmandwantennae «datkwepROwilies Malem ce sivoki els oct cet s 
GO ison opi vis) acied 1s: Helt, ©. 66a 
cc Abdomen reddish brown; ovipositor % the length of the body; 
Renilla ne cee enor oe Sere rena Vol igcutnibams da neGps ©. 150 
ccc Abdomen reddish brown; ovipositor as long as the body; female 
Datisauieheisas Neasp Cy .T40 
bbb 14 antennal segments 
c Posterior tarsi normal 
d Antennal segments sessile 
e Abdomen reddish brown, the 5th antennal segment with 
a length twice its diameter, the 4th palpal segment %4 
longer than the 3d; ovipositor 1/5 the length of the 
al COmlenwenn nn vr. cts race waco elect rae n. sp.s C507 
ee Abdomen bright red, the 5th antennal segment with a 
length 2™4 times its diameter, the 4th palpal segment 
a little longer than the 3d; ovipositor as long as the 
body, female; bred from elm buds and folded leaves.... 
ulmi Beutm., C. 1239, a1683 
dd Antennal segments subsessile, with a stem %4 or 4% the 
length of the basal enlargement 
é 3d vein uniting with costa well beyond the apex 
f Abdomen pale yellowish, the 5th antennal segment 
with a stem 1% the length of the basal enlargement; 
TINA C Senter aerate nan iets eis rete alg wee anialerels & HOO OCOOOCOL 
(Oligotrophus) thalictri Felt, C. 08 
" ee 3d vein uniting with costa just beyond the apex 
f Abdomen brownish red; ovipositor short; female.. 
SO CHAINS vm Sos (C ay 
ff Abdomen rollewich or fuscous yellowish; ventral 
plate of the male deeply and roundly emarginate 
distally; the female with the ovipositor as long as 
the body; bred from rolled violet leaves........... 
(Diplosis) violicola Coq, C ar346 
