All the species of horsetlics 1;iken so far in Ijouisifiiiji he- 

 U.ng to two ji'ener;!. VJirjisopK and TtiJxnius. In Cliriisops C'oar- 

 flies" and "doei-Hies") the Avin^rs ai-e varieerated wilh black, and 

 the varions species are only sli<jflitly larger than the c.omTnon 

 houselly : in 'rdhdiiiis i " horseflies"" ) the winofs are hyaline, or 

 generally niai-ked wilii small lilack or brown spots, and the 

 species are lar^-ei-. some of tlu'm very laruc One or two of tln^ 



^5i^^^ 



^^ 



Kio. 2. — Little earfly (Cliriixiijix jiikiii. male, pii- 

 larged to three dia meters. 



I.'rii'e species hav(> th(^ Avin^s nearly nniforndy black all over, 

 JUxd another smaller one has the winys distinctly variegated 

 vith black. There is no doubt but that there are two or more 

 othei' penera in the State that have not been collected, bnt the 

 ones named above, in any case, inclnde most of the species 

 especially injui'ions in the United States. 



p:G(iS AND E(iG-LAYIN(i IX (iKXKRAL. 

 ,\11 tile species of Cliri/sops whose euu-laying habits 1 know, 

 and nuniy specii's of Tahaiius as well, place their eggs over water, 

 while other species of Tabanus ovijiosit. on plants standing in 

 wet ground. Some species are very precise in placing their eggs 

 Tbus. 'I'dh'tinis shjfjius, which 1 Imve observed mai \- time.- Col- 

 lows the interesting habit of ovipositing on the upper surface 

 <;f the leaves of th.e arrow plant.* placing the eggs just abi^ve 

 the ])oint whcrf the petiole meets the expanded part of the leaf. 

 J^o closely is this habit followed that a hnndi-ed masses of eggs 

 are found thus located to one placed othei-wise. Sometimes a 

 niHSs is obscrxcd on the leaf of another plant, but in the same 

 location, and once in a Ioiil;' time eggs are seen in a diffei-ent 

 position on a le;if. 



'tiai/Htdriii s[>. 



