221 



are seen resting on the bare sand and occasionally making a 

 short quick flight. Bembex spinolce is occasional. The Bembe- 

 cidce oviposit in burrows in the sand and provision them with 

 flies. The red female Mutillidce are conspicuous as they walk 

 hurriedly along, presumably in search of insects with which 

 to stock their nests, often followed by the black, winged 

 males. (PI. XIV., Fig. 1; XV., XVI.) Predaceous flies, Anthrax 

 and Asilidce, the latter including Laphjjstiu, are common, rest- 

 ing on the sand or flying about. (PI. XIV., Fig. 2; XVI.) Those 

 alert personifications of incessant activity, the Ceropalidce, flit 

 rapidly along near the ground amongst the vegetation, (PI. 

 XVI.,) searching for spiders for their nests, and if the spider 

 Phidippus insolens did not look so much like a female mutillid 

 it might not be able to assume the manner which gives it- 

 its specific name. Of course the grasshoppers are a conspicu- 

 ous feature of the blow-sand, Melanoplus flavidus and M. angus- 

 Upennis and the bright- winged CEdipodina'— such as Xph<tr<njr- 

 mon wyomingianum,Hippiscus, Psinidia fenestra I is, and others- 

 jumping about or flying here and there over the bare sand. (PI- 

 XIV., Fig. 1; XV., etc.) 



Logs, boards, dried dung, and other shelters are not very 

 common on the sand prairie, but underneath them we find a 

 second and very interesting group of insect associations. At 

 the Devil's Neck we have found Gryllus personatus, Nothopus 

 zabroides, Ceuthophilus sp., Geopinus incrassatus, Cratacanthus 

 dubius, Harpalus caliginosus, Anisodactylus rusticus, Termes flav- 

 ipes, and others, the Carabidce all quite abundant. In June 

 many Nothopus were found here, but all were dead. Under 

 bark and sticks on sand under trees (PI. XX., Fig. 2) were 

 Ischnoptera incequalis, Udeopsytta robusta, and some curious 

 cydnid nymphs. Beneath boards on very sandy pasture land 

 were Lacon rectangulus and Opatrinus not us in abundance, also 

 Harpalus testaceus and H. erraticus, the latter commonest. Un- 

 der the remnants of a dead animal in a blowout were Trox sea- 

 br.osus and Canthon nigricornis. 



A third group are the burrowersin bare sand, among which 

 are the tiger-beetles and their larvae and various Hynienoptera. 



