216 INSECTS AFFECTING THE ORANGE. 



genus in the society's collection, and do not find anything there agreeing with your 

 specimen. I do not think it has been described, but as I have never worked up the 

 genus, I cannot say definitely that it is new." 



NOTES 6, 7, 8, 9, and 10 (pp. 83 and 84). These mites were mounted in balsam for 

 subsequent study by Professor Riley, with a view of possible determination. He has 

 kindly examined them and furnished the following notes and descriptions: 



"The so-called 'Hairy Orange Mite' (Note 6) is one of the 'Harvest-mites' belong- 

 ing to the section Eupodidce and comes nearer to Penthalodes Murray than to any other 

 defined genus, having 6-jointed legs of about equal length. It may be "described as 

 follows : 



"PENTHALODES MYTILASPIDIS n. sp. Average length, 0.3 mm . Broadly oval; ab- 

 domen tapering to a point. Color dark red, with pale hairs. Head distinctly sep- 

 arated, narrow, elongate, conical. Mandibles scissor-like, projecting. Palpi inserted 

 at apex of cephalothorax, close to the head, stout, 4-jointed, the first joint stoutest, 

 first and second of about equal length, third shortest, the fourth ending in a stout, 

 curved claw at the base of which an elongate Oval thumb is inserted. Eyes barely 

 discernible near the side of the cephalothorax between the first and second pairs of 

 legs. Cephalothorax rounded in front, merging posteriorly into the abdomen, so as to 

 leave no distinct division except in shrunken specimens. Surrounded by rather long 

 and stout bristles, about 8 on each side, and with two rows of similar bristles dor- 

 sally. Legs about equal in length, the first pair very slightly longest ; third joint 

 longest. Claws' 3, much curved at tip, the middle one curved upwards. 



" Of the ' Spear-head Mite' (note 7) the mounted specimens are unfit for study and 

 no determination can be made of them. 



" The so called ' Spotted Mite ' (note 8) is also represented by such poor specimens 

 from the Orange CoecidaB that they could not be used for determination, but I have 

 obtained a closely-related species from twigs containing the eggs of Cicada septendecim, 

 and have thus been able to make out its characters. It belongs to the Beetle-mites or 

 OribatidaD, and the one-clawed section ; but it cannot strictly be placed in any defined 

 genus. As I would not care to erect a new genus in these fragmentary notes, the 

 species may be described under the genus Hermannia,to which it approaches nearest 

 structurally, though bearing no great resemblance to the commoner species of that 

 genus. 



"HERMANNIA (?) TRINEBULOSA n. sp. Length, 0.38 mm . Color whitish, pellucid. 

 Pyri form, surface apparently smooth and polished: three dusky abdominal patches, 

 one large and central, and one at each lower side with a central, elongate-ovoid cor- 

 neous plate ; two dorsal rows of rather long hairs, with a few others at sides, a rather 

 stouter one on each shoulder, and three anal pairs, the intermediate or second pair 

 longest all very minutely barbed. Cephalothorax broadly conical, bluntly rounded 

 in front, separated from the body by a distinct transverse suture; on each side towards 

 the base is a conspicuous, strongly clavate bristle. Palpi 6-jointed, the 2nd joint as 

 long as the others together. All legs of about equal length, 6-jointed ; terminal joint 

 longest, tapering quite suddenly frqm about the middle to the end, especially in the 

 posterior pair of legs. Claw simple, large, and strongly curved. All legs sparsely 

 beset with rather long, simple bristles, which are most numerous on the terminal 

 joint. 



" Of figs. 39 and 40 (notes 9 and 10) the slides are not to be found, but, judging from 

 the figures, the former is a Tyroglyphns, the species of which are very commonly found 

 preying on animal matter, and the latter a Sejus, one of the Gamasid genera. I should 

 not care to describe them by name without study of the specimens." 



NOTE 11 (p. 98). Prof. H. W. Wiley, chemist, U. S. Department of Agriculture, 

 gives the following reactions of sulphur upon lime, treated with boiling water. 



" Depending on the proportion of sulphur used, the products may be considered as 



follows: 



. 3 CaO -f S 6 =2 CaS 2 + CaS 2 O 3 

 Calcium disulphide -}- Calcium thiosulphate 

 " Or, with a greater amount of sulphur, 



3 CaO -f Si 2 =2 CaS 5 -f CaS 2 O 3 

 Calcium penlasulpltide -f- Calcium thiosulphate. 

 "In fact, probably both reactions go on at once, and even more complicated ones. 



