327 



Chapman (R. N.). The Confused Flour Beetle {Tribolium confusum, 

 Duval). — 17th, Rept. Minnesota State Entomologist, Agric. Expt. 

 Sta., Univ. Farm, St. Paul, 1st December 1918, pp. 73-94, 3 plates, 

 1 fig. [Received 21st May 1919.] 



The subject-matter of this paper has already been noticed from 

 another source [see this Review, Ser. A, vii, p. 221]. 



Williamson (W.). The Clover-seed Chalcid, Bruchophagus funebris, 

 Howard. — 17th Rept. Minnesota State Entomologist, Agric. Expt. 

 Sta., Univ. Farm, St. Paul, 1st December 1918, pp. 95-110, 10 

 figs. [Received 21st May 1919.] 



The bulk of the subject-matter of this paper has already been noticed 

 [see this Review, Ser. A, iii, p. 185]. The three known Chalcid parasites 

 of this clover pest are Tetrastichus bruchopJiagi, Ashm., Habrocytus 

 medicaginis, Gah., and Idomacromerus longfellowi, Gir. 



The food-plants are red clover, crimson clover, bur clover and 

 alfalfa ; alsike, white clover and sweet clover are apparently immune 

 to attack. 



Howard (C. W.). A Preliminary Report on the Trombidiidae of 

 Minnesota. — 17th Rept. Minnesota State Entomologist, Agric. Expt. 

 Sta., Univ. Farm, St. Paul, 1st December 1918, pp. 111-144, 7 

 plates. [Received 21st May 1919.] 



This paper deals with a number of Trombidiid mites, with keys 

 to the adults, nymphs and larvae. Among those mentioned are : — 

 Allothrombium pulvinus, Ewing, which is a species that is very benefi- 

 cial in the control of Aphids, as every stage feeds on them, even 

 destroying the winter eggs, while on the other hand it seems to have 

 few enemies. Eutrombidium locustarum, Walsh, is apparently present 

 throughout all the grasshopper areas of the State, the adults being 

 found on or in the soil in open ground during early spring. With the 

 advent of warm weather they emerge in search of grasshopper eggs, 

 and in the breeding-grounds they are so abundant as to give the soil 

 a scarlet appearance. Their distribution is not influenced by the char- 

 acter of the soil, and they may be found on dry, sandy hillsides or in 

 low, wet bottom lands, providing grasshopper eggs of some species 

 are present. This mite has been found to infest the eggs of Melanoplus 

 bivittatus, M. femur-rubrum, M. atlantis, M. minor and Chorthipjms 

 {Stenobothrus) curtipennis. In from 9 to 12 days after engorgement 

 the female oviposits in a smoothed-walled chamber in the soil, |-inch 

 to 1 inch below the surface, the egg-masses consisting of from 300-700 

 eggs, Avhich hatch in from 24 to 30 days. As soon as they hatch the 

 larvae crawl in search of grasshoppers of any stage, to which they 

 attach themselves between the segments, under or on the wing pads, 

 or at the joints of the tarsi or near the mouth. They will attack 

 Tettix sp., Melanoplus bivittatus, M. femur-rubrum, M. gladstoniy 

 Chorthippus curtipennis, Orphulella speciosa and 0. pelidna, as many as 

 124 larvae having been counted on a single grasshopper nymph. 

 The fully engorged larva enters the soil, from which the nymph emerges 



