184 SEVENTEENTH Report STATE ENTOMOLOGIST OF MINNESOTA—1918 
Halliday, in speaking of this group (Ent. Mag. Vol. I p. 342) 
says: “This tribe comprises the very atoms of the order Hymenop- 
tera. Their hues are mostly black or yellowish, unadorned by metallic 
splendor; the plumed and iridescent wings of many are beautiful ob- 
jects for the microscope. . . . The females oviposit in the eggs of 
other insects, from which the tiny parasite emerges only in the per- 
fect state, a single butterfly’s egg often nourishing the transformation 
of many individuals.” 
Polynema consobrinus Gir. has been bred from Anthonomus signa- 
tus by S. Marcovitch in our Insectary (16th Rep. State Ent. Minn. 
1916) and Mr. Marcovitch has also reared Anaphoidea conotracheli 
Gir. from the eggs of the purslane sawfly. Girault reports an egg 
parasite of the codling moth from this family. 
TRICHOGRAMMIDAE 
Tarsi three jointed and antennae elbowed with few joints, at most 9-jointed; 
pubescence of wings arranged linearly. 
Species have been raised from the Buffalo treehopper. Others 
are parasitic on the more common butterflies. In Minnesota, Apros- 
toctus whitmani Gir. has been reared from the eggs of the sunflower 
tortoise beetle Physonata unipuncta Say, and we also have in the state 
Chaetostricha pretiosa Riley. 
EXPLANATION OF COLORED PLATE 2. 
8. Hucerceris zonata Cress. 
9. Microbembex monodonta Say. 
10. Crabro sexmaculatus-Solenius (Xestocrabro) Sayi Ckll. 
11. Halictus (Agapostemon) virescens F. female. 
12. Halictus (Agapostemon) virescens male. 
13. Triepeolus bardus Cress. 
14. Amblyteles (Pterocormus?) longulus Cress. 
15. Chlorion (Ammobia) ichneumon L. 
