5 o8 



Phylum Arthropoda 



should be placed so that when the parasite starts to spin its cocoon it 

 can have a ceiling for the attachment of its silk when spinning, other- 

 wise no cocoon will be formed. If large numbers of parasitized grubs are 

 to be reared, greenhouse flats or trays filled with smoothly pressed soil 

 in which numbers of depressions are made serve the purpose very well, 

 but they too must be covered with paper or cellophane. The boxes 

 may be stacked so as to preserve moisture. 



The cocoons when formed may be removed and stored in the manner 

 described for the maintenance of Tiphia during the winter. If they are 

 formed at the beginning of the summer season, care must be taken to 

 observe the cocoons at intervals, as many of this group have more than 

 one generation a year. Illingworth advises leaving the cocoons in the 

 flats and collecting the emerging adults by inserting a glass tube or vial 

 in one side of each flat or tray. This being the only source of light, the 

 adults enter the tube in an attempt to escape. 



While the writer has had no experience in mating scoliids in cap- 

 tivity, he believes that this could be accomplished by using boxes similar 

 to those described for tiphiids. 



Other important papers* deal with the rearing of these parasites and 

 should be consulted if work of this kind is to be undertaken. 



Reference 

 Family Mutillidae 

 For the rearing of members of this family see p. 517. 



Family 



FORMICIDAE 



LABORATORY MAINTENANCE AND CARE OF THE 

 MOUND-BUILDING ANT, FORMICA ULKEI 



A. M. Holmquist, St. Olaf College, Northfield, Minnesota 



IN KEEPING ants for observation and experimentation in the labora- 

 tory it is necessary to put them in containers that will prevent not 

 only their escape but also their destruction by drowning or other means. 

 The following description of methods used in maintaining Formica 

 ulkei may also be applied to other species of soil-inhabiting ants. 



Stock nests. For maintaining stock colonies of ants in the laboratory, 

 a galvanized tin container, constructed with a space in the center for a 



* Clausen, C. P., King, J. L., and Teranishi, Cho. The parasites of Popillia 

 japouica in Japan and Chosen (Korea) and their introduction into the United States. 

 U. S. Dept. Agr. Bull. 1429, pp. 34-36, illus. 1927. 



Clausen, C. P., Jaynes, H. A., and Gardner, T. R. Further investigations of the 

 parasites of Popillia japonica in the Far East. U. S. Dept. Agr. Tech. Bull. 366, p. 29, 

 illus. I933- 



