After the installation of Express.js the command 'express' to create new applications is not available

Express

➜  Code  npm install -g express
npm http GET https://registry.npmjs.org/express
npm http 304 https://registry.npmjs.org/express
npm http GET https://registry.npmjs.org/connect/2.7.2
npm http GET https://registry.npmjs.org/commander/0.6.1
npm http GET https://registry.npmjs.org/range-parser/0.0.4
npm http GET https://registry.npmjs.org/mkdirp/0.3.3
npm http GET https://registry.npmjs.org/cookie/0.0.5
npm http GET https://registry.npmjs.org/buffer-crc32/0.1.1
npm http GET https://registry.npmjs.org/fresh/0.1.0
npm http GET https://registry.npmjs.org/methods/0.0.1
npm http GET https://registry.npmjs.org/send/0.1.0
npm http GET https://registry.npmjs.org/cookie-signature/0.0.1
npm http GET https://registry.npmjs.org/debug
npm http 304 https://registry.npmjs.org/connect/2.7.2
npm WARN package.json connect@2.7.2 No README.md file found!
npm http 304 https://registry.npmjs.org/commander/0.6.1
npm http 304 https://registry.npmjs.org/range-parser/0.0.4
npm http 304 https://registry.npmjs.org/mkdirp/0.3.3
npm http 304 https://registry.npmjs.org/cookie/0.0.5
npm http 304 https://registry.npmjs.org/buffer-crc32/0.1.1
npm http 304 https://registry.npmjs.org/fresh/0.1.0
npm http 304 https://registry.npmjs.org/methods/0.0.1
npm http 304 https://registry.npmjs.org/send/0.1.0
npm WARN package.json methods@0.0.1 No README.md file found!
npm http 304 https://registry.npmjs.org/cookie-signature/0.0.1
npm http 304 https://registry.npmjs.org/debug
npm http GET https://registry.npmjs.org/mime/1.2.6
npm http GET https://registry.npmjs.org/qs/0.5.1
npm http GET https://registry.npmjs.org/formidable/1.0.11
npm http GET https://registry.npmjs.org/bytes/0.1.0
npm http GET https://registry.npmjs.org/pause/0.0.1
npm http 304 https://registry.npmjs.org/mime/1.2.6
npm http 304 https://registry.npmjs.org/qs/0.5.1
npm http 304 https://registry.npmjs.org/bytes/0.1.0
npm http 304 https://registry.npmjs.org/formidable/1.0.11
npm http 304 https://registry.npmjs.org/pause/0.0.1
/usr/local/share/npm/bin/express -> /usr/local/share/npm/lib/node_modules/express/bin/express
express@3.1.0 /usr/local/share/npm/lib/node_modules/express
├── methods@0.0.1
├── fresh@0.1.0
├── range-parser@0.0.4
├── cookie-signature@0.0.1
├── buffer-crc32@0.1.1
├── cookie@0.0.5
├── debug@0.7.2
├── commander@0.6.1
├── mkdirp@0.3.3
├── send@0.1.0 (mime@1.2.6)
└── connect@2.7.2 (pause@0.0.1, bytes@0.1.0, formidable@1.0.11, qs@0.5.1)
➜  Code  cd Express 
➜  Express  express new HotPie
zsh: command not found: express
➜  Express